diff --git a/app/assets/javascripts/app/controllers/_channel/email.coffee b/app/assets/javascripts/app/controllers/_channel/email.coffee
index ab9915c8f..fd6e67dcd 100644
--- a/app/assets/javascripts/app/controllers/_channel/email.coffee
+++ b/app/assets/javascripts/app/controllers/_channel/email.coffee
@@ -528,7 +528,7 @@ class ChannelEmailAccountWizard extends App.ControllerWizardModal
           @showAlert('js-intro', __('Account already exists!'))
         else
           @showSlide('js-inbound')
-          @showAlert('js-inbound', __('Unable to detect your server settings. Manual configuration needed.'))
+          @showAlert('js-inbound', __('The server settings could not be automatically detected. Please configure them manually.'))
           @$('.js-inbound [name="options::user"]').val(@account['meta']['email'])
           @$('.js-inbound [name="options::password"]').val(@account['meta']['password'])
           @$('.js-inbound [name="options::email"]').val(@account['meta']['email'])
@@ -749,7 +749,7 @@ class ChannelEmailAccountWizard extends App.ControllerWizardModal
               @delay(
                 =>
                   @showSlide('js-intro')
-                  @showAlert('js-intro', __('Unable to verify sending and receiving. Please check your settings.'))
+                  @showAlert('js-intro', __('Email sending and receiving could not be verified. Please check your settings.'))
 
                 2300
               )
@@ -759,7 +759,7 @@ class ChannelEmailAccountWizard extends App.ControllerWizardModal
               @verify(@account, count + 1)
       error: =>
         @showSlide('js-intro')
-        @showAlert('js-intro', __('Unable to verify sending and receiving. Please check your settings.'))
+        @showAlert('js-intro', __('Email sending and receiving could not be verified. Please check your settings.'))
     )
 
   hide: (e) =>
diff --git a/app/assets/javascripts/app/controllers/_channel/facebook.coffee b/app/assets/javascripts/app/controllers/_channel/facebook.coffee
index c387aa66b..d3393c144 100644
--- a/app/assets/javascripts/app/controllers/_channel/facebook.coffee
+++ b/app/assets/javascripts/app/controllers/_channel/facebook.coffee
@@ -182,7 +182,7 @@ class AppConfig extends App.ControllerModal
           )
           return
         @formEnable(e)
-        @el.find('.alert').removeClass('hidden').text(data.error || __('Unable to verify App.'))
+        @el.find('.alert').removeClass('hidden').text(data.error || __('App could not be verified.'))
     )
 
 class AccountEdit extends App.ControllerModal
diff --git a/app/assets/javascripts/app/controllers/_channel/google.coffee b/app/assets/javascripts/app/controllers/_channel/google.coffee
index bc4fca2dd..32ac7e513 100644
--- a/app/assets/javascripts/app/controllers/_channel/google.coffee
+++ b/app/assets/javascripts/app/controllers/_channel/google.coffee
@@ -425,7 +425,7 @@ class AppConfig extends App.ControllerModal
           )
           return
         @formEnable(e)
-        @el.find('.alert').removeClass('hidden').text(data.error || __('Unable to verify App.'))
+        @el.find('.alert').removeClass('hidden').text(data.error || __('App could not be verified.'))
     )
 
 App.Config.set('google', { prio: 5000, name: __('Google'), parent: '#channels', target: '#channels/google', controller: App.ChannelGoogle, permission: ['admin.channel_google'] }, 'NavBarAdmin')
diff --git a/app/assets/javascripts/app/controllers/_channel/microsoft365.coffee b/app/assets/javascripts/app/controllers/_channel/microsoft365.coffee
index 4fda03822..5803fc998 100644
--- a/app/assets/javascripts/app/controllers/_channel/microsoft365.coffee
+++ b/app/assets/javascripts/app/controllers/_channel/microsoft365.coffee
@@ -416,7 +416,7 @@ class AppConfig extends App.ControllerModal
           )
           return
         @formEnable(e)
-        @el.find('.alert').removeClass('hidden').text(data.error || __('Unable to verify App.'))
+        @el.find('.alert').removeClass('hidden').text(data.error || __('App could not be verified.'))
     )
 
 App.Config.set('microsoft365', { prio: 5000, name: __('Microsoft 365'), parent: '#channels', target: '#channels/microsoft365', controller: App.ChannelMicrosoft365, permission: ['admin.channel_microsoft365'] }, 'NavBarAdmin')
diff --git a/app/assets/javascripts/app/controllers/_channel/sms.coffee b/app/assets/javascripts/app/controllers/_channel/sms.coffee
index d4ca67f05..50b5364a4 100644
--- a/app/assets/javascripts/app/controllers/_channel/sms.coffee
+++ b/app/assets/javascripts/app/controllers/_channel/sms.coffee
@@ -435,7 +435,7 @@ class TestModal extends App.ControllerModal
         data = JSON.parse(xhr.responseText)
         @formEnable(@el)
         @el.find('.js-danger')
-          .text(@T(data.error || __('Unable to perform test')))
+          .text(@T(data.error || __('SMS test failed.')))
           .removeClass('hide')
     )
 
diff --git a/app/assets/javascripts/app/controllers/_channel/telegram.coffee b/app/assets/javascripts/app/controllers/_channel/telegram.coffee
index 8617e925e..fb954b1be 100644
--- a/app/assets/javascripts/app/controllers/_channel/telegram.coffee
+++ b/app/assets/javascripts/app/controllers/_channel/telegram.coffee
@@ -149,7 +149,7 @@ class BotAdd extends App.ControllerModal
       error: (xhr) =>
         data = JSON.parse(xhr.responseText)
         @formEnable(e)
-        error_message = App.i18n.translateContent(data.error || __('Unable to save Bot.'))
+        error_message = App.i18n.translateContent(data.error || __('The Telegram bot could not be saved.'))
         @el.find('.alert').removeClass('hidden').text(error_message)
     )
 
diff --git a/app/assets/javascripts/app/controllers/_channel/twitter.coffee b/app/assets/javascripts/app/controllers/_channel/twitter.coffee
index f568a922a..2f0a90c42 100644
--- a/app/assets/javascripts/app/controllers/_channel/twitter.coffee
+++ b/app/assets/javascripts/app/controllers/_channel/twitter.coffee
@@ -189,7 +189,7 @@ class AppConfig extends App.ControllerModal
           )
           return
         @formEnable(e)
-        @el.find('.alert').removeClass('hidden').text(data.error || __('Unable to verify App.'))
+        @el.find('.alert').removeClass('hidden').text(data.error || __('App could not be verified.'))
     )
 
 class AccountEdit extends App.ControllerModal
diff --git a/app/assets/javascripts/app/controllers/_integration/exchange.coffee b/app/assets/javascripts/app/controllers/_integration/exchange.coffee
index 793ed7508..0071d668a 100644
--- a/app/assets/javascripts/app/controllers/_integration/exchange.coffee
+++ b/app/assets/javascripts/app/controllers/_integration/exchange.coffee
@@ -282,7 +282,7 @@ class ConnectionWizard extends App.ControllerWizardModal
         if !_.isEmpty(detailsRaw)
           details = JSON.parse(detailsRaw)
         @showSlide('js-discover')
-        @showAlert('js-discover', details.error || __('Unable to perform backend.'))
+        @showAlert('js-discover', details.error || __('Server operation failed.'))
     )
 
   folders: (e) =>
@@ -323,7 +323,7 @@ class ConnectionWizard extends App.ControllerWizardModal
         if !_.isEmpty(detailsRaw)
           details = JSON.parse(detailsRaw)
         @showSlide('js-bind')
-        @showAlert('js-bind', details.error || __('Unable to perform backend.'))
+        @showAlert('js-bind', details.error || __('Server operation failed.'))
     )
 
   foldersShow: (alreadyShown) =>
@@ -429,7 +429,7 @@ class ConnectionWizard extends App.ControllerWizardModal
         if !_.isEmpty(detailsRaw)
           details = JSON.parse(detailsRaw)
         @showSlide('js-folders')
-        @showAlert('js-folders', details.error || __('Unable to perform backend.'))
+        @showAlert('js-folders', details.error || __('Server operation failed.'))
     )
 
   mappingShow: (alreadyShown) =>
diff --git a/app/assets/javascripts/app/controllers/_integration/github.coffee b/app/assets/javascripts/app/controllers/_integration/github.coffee
index 366599c30..74058c014 100644
--- a/app/assets/javascripts/app/controllers/_integration/github.coffee
+++ b/app/assets/javascripts/app/controllers/_integration/github.coffee
@@ -60,7 +60,7 @@ class Form extends App.Controller
         details = data.responseJSON || {}
         App.Event.trigger 'notify', {
           type: 'error'
-          msg:  App.i18n.translateContent(details.error_human || details.error || __('Unable to save!'))
+          msg:  App.i18n.translateContent(details.error_human || details.error || __('Saving failed.'))
         }
     )
 
diff --git a/app/assets/javascripts/app/controllers/_integration/gitlab.coffee b/app/assets/javascripts/app/controllers/_integration/gitlab.coffee
index 461cc9ced..344fa4df6 100644
--- a/app/assets/javascripts/app/controllers/_integration/gitlab.coffee
+++ b/app/assets/javascripts/app/controllers/_integration/gitlab.coffee
@@ -60,7 +60,7 @@ class Form extends App.Controller
         details = data.responseJSON || {}
         App.Event.trigger 'notify', {
           type: 'error'
-          msg:  App.i18n.translateContent(details.error_human || details.error || __('Unable to save!'))
+          msg:  App.i18n.translateContent(details.error_human || details.error || __('Saving failed.'))
         }
     )
 
diff --git a/app/assets/javascripts/app/controllers/_integration/idoit.coffee b/app/assets/javascripts/app/controllers/_integration/idoit.coffee
index 0f9f16131..699273ec5 100644
--- a/app/assets/javascripts/app/controllers/_integration/idoit.coffee
+++ b/app/assets/javascripts/app/controllers/_integration/idoit.coffee
@@ -73,7 +73,7 @@ class Form extends App.Controller
         details = data.responseJSON || {}
         @notify(
           type: 'error'
-          msg:  App.i18n.translateContent(details.error_human || details.error || __('Unable to save!'))
+          msg:  App.i18n.translateContent(details.error_human || details.error || __('Saving failed.'))
         )
     )
 
diff --git a/app/assets/javascripts/app/controllers/_integration/ldap.coffee b/app/assets/javascripts/app/controllers/_integration/ldap.coffee
index a791b15d2..1f89ce99c 100644
--- a/app/assets/javascripts/app/controllers/_integration/ldap.coffee
+++ b/app/assets/javascripts/app/controllers/_integration/ldap.coffee
@@ -315,7 +315,7 @@ class ConnectionWizard extends App.ControllerWizardModal
         if !_.isEmpty(detailsRaw)
           details = JSON.parse(detailsRaw)
         @showSlide('js-discover')
-        @showAlert('js-discover', details.error || __('Unable to perform backend.'))
+        @showAlert('js-discover', details.error || __('Server operation failed.'))
     )
 
 
@@ -384,7 +384,7 @@ class ConnectionWizard extends App.ControllerWizardModal
         if !_.isEmpty(detailsRaw)
           details = JSON.parse(detailsRaw)
         @showSlide('js-bind')
-        @showAlert('js-bind', details.error || __('Unable to perform backend.'))
+        @showAlert('js-bind', details.error || __('Server operation failed.'))
     )
 
   mappingShow: (alreadyShown) =>
diff --git a/app/assets/javascripts/app/controllers/_integration/smime.coffee b/app/assets/javascripts/app/controllers/_integration/smime.coffee
index 35ea7022e..837e16b6b 100644
--- a/app/assets/javascripts/app/controllers/_integration/smime.coffee
+++ b/app/assets/javascripts/app/controllers/_integration/smime.coffee
@@ -106,7 +106,7 @@ class Certificate extends App.ControllerModal
         details = data.responseJSON || {}
         @notify
           type:    'error'
-          msg:     App.i18n.translateContent(details.error_human || details.error || __('Unable to import!'))
+          msg:     App.i18n.translateContent(details.error_human || details.error || __('The import failed.'))
           timeout: 6000
     )
 
@@ -149,7 +149,7 @@ class PrivateKey extends App.ControllerModal
         details = data.responseJSON || {}
         @notify
           type:    'error'
-          msg:     App.i18n.translateContent(details.error_human || details.error || __('Unable to import!'))
+          msg:     App.i18n.translateContent(details.error_human || details.error || __('The import failed.'))
           timeout: 6000
     )
 
@@ -178,7 +178,7 @@ class List extends App.Controller
         details = data.responseJSON || {}
         @notify(
           type: 'error'
-          msg:  App.i18n.translateContent(details.error_human || details.error || __('Unable to load list of certificates!'))
+          msg:  App.i18n.translateContent(details.error_human || details.error || __('Loading failed.'))
         )
 
         # do something
@@ -210,7 +210,7 @@ class List extends App.Controller
         details = data.responseJSON || {}
         @notify(
           type: 'error'
-          msg:  App.i18n.translateContent(details.error_human || details.error || __('Unable to save!'))
+          msg:  App.i18n.translateContent(details.error_human || details.error || __('Server operation failed.'))
         )
     )
 
diff --git a/app/assets/javascripts/app/controllers/_profile/password.coffee b/app/assets/javascripts/app/controllers/_profile/password.coffee
index c84e9a08e..9bde885bc 100644
--- a/app/assets/javascripts/app/controllers/_profile/password.coffee
+++ b/app/assets/javascripts/app/controllers/_profile/password.coffee
@@ -74,7 +74,7 @@ class ProfilePassword extends App.ControllerSubContent
       else
         @notify
           type:      'error'
-          msg:       __('Unable to set password. Please contact your administrator.')
+          msg:       __('The password could not be set. Please contact your administrator.')
           removeAll: true
       @formEnable( @$('form') )
 
diff --git a/app/assets/javascripts/app/controllers/agent_ticket_merge.coffee b/app/assets/javascripts/app/controllers/agent_ticket_merge.coffee
index a071f0173..e1d589779 100644
--- a/app/assets/javascripts/app/controllers/agent_ticket_merge.coffee
+++ b/app/assets/javascripts/app/controllers/agent_ticket_merge.coffee
@@ -113,7 +113,7 @@ class App.TicketMerge extends App.ControllerModal
         details = data.responseJSON || {}
         @notify
           type:    'error'
-          msg:     App.i18n.translateContent(details.error_human || details.error || __('Unable to merge!'))
+          msg:     App.i18n.translateContent(details.error_human || details.error || __('The tickets could not be merged.'))
           timeout: 6000
         @formEnable(e)
     )
diff --git a/app/assets/javascripts/app/controllers/email_verify.coffee b/app/assets/javascripts/app/controllers/email_verify.coffee
index aa2a978d9..17c1b22cb 100644
--- a/app/assets/javascripts/app/controllers/email_verify.coffee
+++ b/app/assets/javascripts/app/controllers/email_verify.coffee
@@ -50,7 +50,7 @@ class Fail extends App.ControllerAppContent
 
   render: =>
     @renderScreenError(
-      detail: __('Unable to verify email. Please contact your administrator.')
+      detail: __('Email could not be verified. Please contact your administrator.')
     )
 
 App.Config.set('email_verify/:token', EmailVerify, 'Routes')
diff --git a/app/assets/javascripts/app/controllers/getting_started/admin.coffee b/app/assets/javascripts/app/controllers/getting_started/admin.coffee
index 099b834c4..abcb12690 100644
--- a/app/assets/javascripts/app/controllers/getting_started/admin.coffee
+++ b/app/assets/javascripts/app/controllers/getting_started/admin.coffee
@@ -101,7 +101,7 @@ class GettingStartedAdmin extends App.ControllerWizardFullScreen
 
       fail: (settings, details) =>
         @formEnable(e)
-        @form.showAlert(details.error_human || details.error || __('Unable to create user!'))
+        @form.showAlert(details.error_human || details.error || __('User could not be created.'))
     )
 
   relogin: (data, status, xhr) =>
diff --git a/app/assets/javascripts/app/controllers/getting_started/channel_email.coffee b/app/assets/javascripts/app/controllers/getting_started/channel_email.coffee
index a0cec41d6..98ff307fd 100644
--- a/app/assets/javascripts/app/controllers/getting_started/channel_email.coffee
+++ b/app/assets/javascripts/app/controllers/getting_started/channel_email.coffee
@@ -178,7 +178,7 @@ class GettingStartedChannelEmail extends App.ControllerWizardFullScreen
           @showAlert('js-intro', __('Account already exists!') )
         else
           @showSlide('js-inbound')
-          @showAlert('js-inbound', __('Unable to detect your server settings. Manual configuration needed.') )
+          @showAlert('js-inbound', __('The server settings could not be automatically detected. Please configure them manually.') )
           @$('.js-inbound [name="options::user"]').val( @account['meta']['email'] )
           @$('.js-inbound [name="options::password"]').val( @account['meta']['password'] )
 
@@ -354,7 +354,7 @@ class GettingStartedChannelEmail extends App.ControllerWizardFullScreen
               @delay(
                 =>
                   @showSlide('js-intro')
-                  @showAlert('js-intro', __('Unable to verify sending and receiving. Please check your settings.') )
+                  @showAlert('js-intro', __('Email sending and receiving could not be verified. Please check your settings.') )
 
                 2300
               )
@@ -364,7 +364,7 @@ class GettingStartedChannelEmail extends App.ControllerWizardFullScreen
               @verify( @account, count + 1 )
       fail: =>
         @showSlide('js-intro')
-        @showAlert('js-intro', __('Unable to verify sending and receiving. Please check your settings.'))
+        @showAlert('js-intro', __('Email sending and receiving could not be verified. Please check your settings.'))
     )
 
 App.Config.set('getting_started/channel/email', GettingStartedChannelEmail, 'Routes')
diff --git a/app/assets/javascripts/app/controllers/idoit_object_selector.coffee b/app/assets/javascripts/app/controllers/idoit_object_selector.coffee
index df4669e06..026e6cea2 100644
--- a/app/assets/javascripts/app/controllers/idoit_object_selector.coffee
+++ b/app/assets/javascripts/app/controllers/idoit_object_selector.coffee
@@ -39,7 +39,7 @@ class App.IdoitObjectSelector extends App.ControllerModal
         return if status is 'abort'
 
         # show error message
-        @contentInline = __('Unable to load content')
+        @contentInline = __('Content could not be loaded.')
         @render()
     )
     ''
@@ -71,7 +71,7 @@ class App.IdoitObjectSelector extends App.ControllerModal
         return if status is 'abort'
 
         # show error message
-        @contentInline = __('Unable to load content')
+        @contentInline = __('Content could not be loaded.')
         @render()
     )
 
diff --git a/app/assets/javascripts/app/controllers/knowledge_base/delete_action.coffee b/app/assets/javascripts/app/controllers/knowledge_base/delete_action.coffee
index d9d356c3b..78a9fc85c 100644
--- a/app/assets/javascripts/app/controllers/knowledge_base/delete_action.coffee
+++ b/app/assets/javascripts/app/controllers/knowledge_base/delete_action.coffee
@@ -64,7 +64,7 @@ class App.KnowledgeBaseDeleteAction
 
   deleteFailure: (modal, xhr) ->
     modal.formEnable(modal.el)
-    modal.showAlert xhr.responseJSON?.error || __('Unable to delete.')
+    modal.showAlert xhr.responseJSON?.error || __('Deletion failed.')
 
   # simulate modal's close function
   close: ->
diff --git a/app/assets/javascripts/app/controllers/knowledge_base/search_field_widget.coffee b/app/assets/javascripts/app/controllers/knowledge_base/search_field_widget.coffee
index e9ce3bea1..dc97bffd8 100644
--- a/app/assets/javascripts/app/controllers/knowledge_base/search_field_widget.coffee
+++ b/app/assets/javascripts/app/controllers/knowledge_base/search_field_widget.coffee
@@ -100,7 +100,7 @@ class App.KnowledgeBaseSearchFieldWidget extends App.Controller
 
     @searchField.removeClass('loading')
 
-    text = xhr.responseJSON?.error_human || xhr.responseJSON?.errorr || __('Unable to load')
+    text = xhr.responseJSON?.error_human || xhr.responseJSON?.errorr || __('Loading failed.')
     @renderError(text)
 
   onSuccess: (data, originalQuery) =>
diff --git a/app/assets/javascripts/app/controllers/password_reset_verify.coffee b/app/assets/javascripts/app/controllers/password_reset_verify.coffee
index 321155b2e..c3a71c648 100644
--- a/app/assets/javascripts/app/controllers/password_reset_verify.coffee
+++ b/app/assets/javascripts/app/controllers/password_reset_verify.coffee
@@ -133,7 +133,7 @@ class PasswordResetVerify extends App.ControllerFullPage
       else
         @notify(
           type:      'error'
-          msg:       __('Unable to set password. Please contact your administrator.')
+          msg:       __('The password could not be set. Please contact your administrator.')
           removeAll: true
         )
       @formEnable(@$('form'))
diff --git a/app/assets/javascripts/app/controllers/signup.coffee b/app/assets/javascripts/app/controllers/signup.coffee
index 3158b488a..3f4325ece 100644
--- a/app/assets/javascripts/app/controllers/signup.coffee
+++ b/app/assets/javascripts/app/controllers/signup.coffee
@@ -74,7 +74,7 @@ class Signup extends App.ControllerFullPage
         ))
       fail: (settings, details) =>
         @formEnable(e)
-        @form.showAlert(details.error_human || details.error || __('Unable to create user!'))
+        @form.showAlert(details.error_human || details.error || __('User could not be created.'))
     )
 
   resend: (e) =>
diff --git a/app/assets/javascripts/app/controllers/ticket_zoom.coffee b/app/assets/javascripts/app/controllers/ticket_zoom.coffee
index 0f87bb3a9..362dc38d7 100644
--- a/app/assets/javascripts/app/controllers/ticket_zoom.coffee
+++ b/app/assets/javascripts/app/controllers/ticket_zoom.coffee
@@ -1022,7 +1022,7 @@ class App.TicketZoom extends App.Controller
           error = settings.responseJSON.error
         App.Event.trigger 'notify', {
           type:    'error'
-          msg:     App.i18n.translateContent(details.error_human || details.error || error || __('Unable to update!'))
+          msg:     App.i18n.translateContent(details.error_human || details.error || error || __('Saving failed.'))
           timeout: 2000
         }
         @autosaveStart()
diff --git a/app/assets/javascripts/app/controllers/ticket_zoom/article_action/delete.coffee b/app/assets/javascripts/app/controllers/ticket_zoom/article_action/delete.coffee
index c15f60fa4..41e52b2d0 100644
--- a/app/assets/javascripts/app/controllers/ticket_zoom/article_action/delete.coffee
+++ b/app/assets/javascripts/app/controllers/ticket_zoom/article_action/delete.coffee
@@ -57,7 +57,7 @@ class Delete
           ui.log 'errors', details
           ui.notify(
             type:    'error'
-            msg:     App.i18n.translateContent(details.error_human || details.error || __('Unable to delete article!'))
+            msg:     App.i18n.translateContent(details.error_human || details.error || __('Article could not be deleted.'))
             timeout: 6000
         )
       )
diff --git a/app/assets/javascripts/app/controllers/ticket_zoom/sidebar_git_issue.coffee b/app/assets/javascripts/app/controllers/ticket_zoom/sidebar_git_issue.coffee
index ee2c41643..46625cea3 100644
--- a/app/assets/javascripts/app/controllers/ticket_zoom/sidebar_git_issue.coffee
+++ b/app/assets/javascripts/app/controllers/ticket_zoom/sidebar_git_issue.coffee
@@ -70,7 +70,7 @@ class App.SidebarGitIssue extends App.Controller
                 success: =>
                   ui.close()
                   @renderIssues()
-                error: (message = __('Unable to save issue')) =>
+                error: (message = __('The issue could not be saved.')) =>
                   ui.showAlert(App.i18n.translatePlain(message))
                   form = ui.el.find('.js-result')
                   @formEnable(form)
@@ -78,7 +78,7 @@ class App.SidebarGitIssue extends App.Controller
             else
               ui.close()
               @renderIssues()
-          error: (message = __('Unable to load issues')) =>
+          error: (message = __('Loading failed.')) =>
             ui.showAlert(App.i18n.translatePlain(message))
             form = ui.el.find('.js-result')
             @formEnable(form)
@@ -126,7 +126,7 @@ class App.SidebarGitIssue extends App.Controller
         @issueLinkData = result
         @renderIssues()
       error: =>
-        @showError(App.i18n.translateInline('Unable to load issues'))
+        @showError(App.i18n.translateInline('Loading failed.'))
     )
 
   getIssues: (params) ->
@@ -141,7 +141,7 @@ class App.SidebarGitIssue extends App.Controller
           # some issues redirect to pull requests like
           # https://github.com/zammad/zammad/issues/1574
           # in this case throw error
-          return params.error(__('Unable to load issues')) if _.isEmpty(data.response)
+          return params.error(__('Loading failed.')) if _.isEmpty(data.response)
 
           params.success(data.response)
         else
@@ -176,7 +176,7 @@ class App.SidebarGitIssue extends App.Controller
         links: @issueLinks
         success: =>
           @renderIssues()
-        error: (message = __('Unable to save issue')) =>
+        error: (message = __('The issue could not be saved.')) =>
           @showError(App.i18n.translateInline(message))
       )
     else
diff --git a/app/assets/javascripts/app/controllers/ticket_zoom/sidebar_idoit.coffee b/app/assets/javascripts/app/controllers/ticket_zoom/sidebar_idoit.coffee
index 99a1bdc5a..d2fca7b2e 100644
--- a/app/assets/javascripts/app/controllers/ticket_zoom/sidebar_idoit.coffee
+++ b/app/assets/javascripts/app/controllers/ticket_zoom/sidebar_idoit.coffee
@@ -67,7 +67,7 @@ class SidebarIdoit extends App.Controller
         if data.response
           @showList(data.response.result)
           return
-        @showError(__('Unable to load data…'))
+        @showError(__('Loading failed.'))
 
       error: (xhr, status, error) =>
 
@@ -75,7 +75,7 @@ class SidebarIdoit extends App.Controller
         return if status is 'abort'
 
         # show error message
-        @showError(__('Unable to load data…'))
+        @showError(__('Loading failed.'))
     )
 
   showList: (objects) =>
diff --git a/app/assets/javascripts/app/controllers/widget/import.coffee b/app/assets/javascripts/app/controllers/widget/import.coffee
index 1e0d87024..baa1c9693 100644
--- a/app/assets/javascripts/app/controllers/widget/import.coffee
+++ b/app/assets/javascripts/app/controllers/widget/import.coffee
@@ -61,7 +61,7 @@ class App.Import extends App.ControllerModal
         details = data.responseJSON || {}
         @notify
           type:    'error'
-          msg:     App.i18n.translateContent(details.error_human || details.error || __('Unable to import!'))
+          msg:     App.i18n.translateContent(details.error_human || details.error || __('The import failed.'))
           timeout: 6000
         @formEnable(e)
     )
diff --git a/app/assets/javascripts/app/controllers/widget/import_try_result.coffee b/app/assets/javascripts/app/controllers/widget/import_try_result.coffee
index 23837d51f..804c4e7ee 100644
--- a/app/assets/javascripts/app/controllers/widget/import_try_result.coffee
+++ b/app/assets/javascripts/app/controllers/widget/import_try_result.coffee
@@ -59,7 +59,7 @@ class App.ImportTryResult extends App.ControllerModal
         details = data.responseJSON || {}
         @notify
           type:    'error'
-          msg:     App.i18n.translateContent(details.error_human || details.error || __('Unable to import!'))
+          msg:     App.i18n.translateContent(details.error_human || details.error || __('The import failed.'))
           timeout: 6000
         @formEnable(e)
     )
diff --git a/app/assets/javascripts/app/controllers/widget/payload_example.coffee b/app/assets/javascripts/app/controllers/widget/payload_example.coffee
index a31e3dc53..f42ae6a34 100644
--- a/app/assets/javascripts/app/controllers/widget/payload_example.coffee
+++ b/app/assets/javascripts/app/controllers/widget/payload_example.coffee
@@ -31,6 +31,6 @@ class App.WidgetPayloadExample extends App.ControllerModal
         details = data.responseJSON || {}
         @notify
           type:    'error'
-          msg:     App.i18n.translateContent(details.error_human || details.error || __('Unable to load example payload!'))
+          msg:     App.i18n.translateContent(details.error_human || details.error || __('Loading failed.'))
           timeout: 6000
     )
diff --git a/app/assets/javascripts/app/models/knowledge_base_answer_translation.coffee b/app/assets/javascripts/app/models/knowledge_base_answer_translation.coffee
index 438c1b60e..658b70c71 100644
--- a/app/assets/javascripts/app/models/knowledge_base_answer_translation.coffee
+++ b/app/assets/javascripts/app/models/knowledge_base_answer_translation.coffee
@@ -48,7 +48,7 @@ class App.KnowledgeBaseAnswerTranslation extends App.Model
 
         App.Event.trigger 'notify', {
           type: 'error'
-          msg: xhr.responseJSON?.error || __('Unable to load')
+          msg: xhr.responseJSON?.error || __('Loading failed.')
         }
     )
 
diff --git a/app/assets/javascripts/app/views/knowledge_base/base_form.coffee b/app/assets/javascripts/app/views/knowledge_base/base_form.coffee
index ebc10c76a..c925e38d5 100644
--- a/app/assets/javascripts/app/views/knowledge_base/base_form.coffee
+++ b/app/assets/javascripts/app/views/knowledge_base/base_form.coffee
@@ -85,7 +85,7 @@ class App.KnowledgeBaseForm extends App.Controller
         @scrollTop()
       error: (xhr) =>
         @formEnable(@el)
-        formController.showAlert(xhr.responseJSON?.error || __('Unable to  save changes'))
+        formController.showAlert(xhr.responseJSON?.error || __('Changes could not be saved.'))
         @scrollTop()
     )
 
diff --git a/app/controllers/getting_started_controller.rb b/app/controllers/getting_started_controller.rb
index fe175451f..332b28932 100644
--- a/app/controllers/getting_started_controller.rb
+++ b/app/controllers/getting_started_controller.rb
@@ -128,7 +128,7 @@ curl http://localhost/api/v1/getting_started -v -u #{login}:#{password}
     if params[:logo] && params[:logo] =~ %r{^data:image}i
       file = StaticAssets.data_url_attributes(params[:logo])
       if !file[:content] || !file[:mime_type]
-        messages[:logo] = __('Unable to process image upload.')
+        messages[:logo] = __('The uploaded image could not be processed.')
       end
     end
 
diff --git a/app/controllers/import_otrs_controller.rb b/app/controllers/import_otrs_controller.rb
index 92eb77694..3c4febfbe 100644
--- a/app/controllers/import_otrs_controller.rb
+++ b/app/controllers/import_otrs_controller.rb
@@ -60,7 +60,7 @@ class ImportOtrsController < ApplicationController
           if !key_parts[1]
             render json: {
               result:        'invalid',
-              message_human: __('Unable to get key from URL!')
+              message_human: __('Import API key could not be extracted from URL.')
             }
             return
           end
diff --git a/app/controllers/settings_controller.rb b/app/controllers/settings_controller.rb
index 81b393f93..27c1b70e6 100644
--- a/app/controllers/settings_controller.rb
+++ b/app/controllers/settings_controller.rb
@@ -56,7 +56,7 @@ class SettingsController < ApplicationController
     if !file[:content] || !file[:mime_type]
       render json: {
         result:  'invalid',
-        message: __('Unable to process image upload.'),
+        message: __('The uploaded image could not be processed.'),
       }
       return
     end
diff --git a/app/jobs/communicate_sms_job.rb b/app/jobs/communicate_sms_job.rb
index 8664af63a..d87c933b7 100644
--- a/app/jobs/communicate_sms_job.rb
+++ b/app/jobs/communicate_sms_job.rb
@@ -107,6 +107,6 @@ class CommunicateSmsJob < ApplicationJob
   end
 
   def log_error_prefix
-    'Unable to send sms message' # rubocop:disable Zammad/DetectTranslatableString
+    'Unable to send SMS message' # rubocop:disable Zammad/DetectTranslatableString
   end
 end
diff --git a/app/models/store.rb b/app/models/store.rb
index 7b89b4828..c9f5cef56 100644
--- a/app/models/store.rb
+++ b/app/models/store.rb
@@ -160,7 +160,7 @@ returns
     if !file
       raise "No such file #{store_file_id}!"
     end
-    raise __('Unable to generate preview') if options[:silence] != true && preferences[:content_preview] != true
+    raise __('Content preview could not be generated.') if options[:silence] != true && preferences[:content_preview] != true
 
     image_resize(file.content, 200)
   end
@@ -183,7 +183,7 @@ returns
     if !file
       raise "No such file #{store_file_id}!"
     end
-    raise __('Unable to generate inline') if options[:silence] != true && preferences[:content_inline] != true
+    raise __('Inline content could not be generated.') if options[:silence] != true && preferences[:content_inline] != true
 
     image_resize(file.content, 1800)
   end
diff --git a/app/models/ticket.rb b/app/models/ticket.rb
index 8cbdceffd..936f6db1a 100644
--- a/app/models/ticket.rb
+++ b/app/models/ticket.rb
@@ -999,7 +999,7 @@ perform changes on ticket
         if value['pre_condition'].start_with?('not_set')
           value['value'] = 1
         elsif value['pre_condition'].start_with?('current_user.')
-          raise __('Unable to use current_user, got no current_user_id for ticket.perform_changes') if !current_user_id
+          raise __("The required parameter 'current_user_id' is missing.") if !current_user_id
 
           value['value'] = current_user_id
         end
@@ -1021,7 +1021,7 @@ perform changes on ticket
     objects = build_notification_template_objects(article)
 
     perform_article.each do |key, value|
-      raise __('Unable to create article, we only support article.note') if key != 'article.note'
+      raise __("Article could not be created. An unsupported key other than 'article.note' was provided.") if key != 'article.note'
 
       add_trigger_note(id, value, objects, perform_origin)
     end
diff --git a/i18n/zammad.pot b/i18n/zammad.pot
index c24974872..ccd861825 100644
--- a/i18n/zammad.pot
+++ b/i18n/zammad.pot
@@ -780,6 +780,13 @@ msgstr ""
 msgid "App Version"
 msgstr ""
 
+#: app/assets/javascripts/app/controllers/_channel/facebook.coffee
+#: app/assets/javascripts/app/controllers/_channel/google.coffee
+#: app/assets/javascripts/app/controllers/_channel/microsoft365.coffee
+#: app/assets/javascripts/app/controllers/_channel/twitter.coffee
+msgid "App could not be verified."
+msgstr ""
+
 #: db/seeds/settings.rb
 msgid "App credentials for Facebook."
 msgstr ""
@@ -851,6 +858,14 @@ msgstr ""
 msgid "Article Count"
 msgstr ""
 
+#: app/models/ticket.rb
+msgid "Article could not be created. An unsupported key other than 'article.note' was provided."
+msgstr ""
+
+#: app/assets/javascripts/app/controllers/ticket_zoom/article_action/delete.coffee
+msgid "Article could not be deleted."
+msgstr ""
+
 #: app/assets/javascripts/app/models/ticket.coffee
 msgid "Article#"
 msgstr ""
@@ -1413,6 +1428,10 @@ msgstr ""
 msgid "Cc"
 msgstr ""
 
+#: lib/secure_mailing/smime/incoming.rb
+msgid "Certificate for verification could not be found."
+msgstr ""
+
 #: app/assets/javascripts/app/views/integration/smime.jst.eco
 msgid "Certificates & Private Keys"
 msgstr ""
@@ -1463,6 +1482,10 @@ msgstr ""
 msgid "Changes"
 msgstr ""
 
+#: app/assets/javascripts/app/views/knowledge_base/base_form.coffee
+msgid "Changes could not be saved."
+msgstr ""
+
 #: app/assets/javascripts/app/views/object_manager/index.jst.eco
 msgid "Changes were made that require a database update."
 msgstr ""
@@ -1930,6 +1953,14 @@ msgstr ""
 msgid "Content"
 msgstr ""
 
+#: app/assets/javascripts/app/controllers/idoit_object_selector.coffee
+msgid "Content could not be loaded."
+msgstr ""
+
+#: app/models/store.rb
+msgid "Content preview could not be generated."
+msgstr ""
+
 #: app/assets/javascripts/app/controllers/knowledge_base/content_controller.coffee
 msgid "Content was changed since loading"
 msgstr ""
@@ -3069,6 +3100,10 @@ msgstr ""
 msgid "Deletion Task"
 msgstr ""
 
+#: app/assets/javascripts/app/controllers/knowledge_base/delete_action.coffee
+msgid "Deletion failed."
+msgstr ""
+
 #: app/assets/javascripts/app/views/ticket_zoom/article_view_delivery_failed.jst.eco
 msgid "Delivery failed"
 msgstr ""
@@ -3431,6 +3466,15 @@ msgstr ""
 msgid "Email Outbound"
 msgstr ""
 
+#: app/assets/javascripts/app/controllers/email_verify.coffee
+msgid "Email could not be verified. Please contact your administrator."
+msgstr ""
+
+#: app/assets/javascripts/app/controllers/_channel/email.coffee
+#: app/assets/javascripts/app/controllers/getting_started/channel_email.coffee
+msgid "Email sending and receiving could not be verified. Please check your settings."
+msgstr ""
+
 #: app/assets/javascripts/app/controllers/user_profile.coffee
 msgid "Email sent to \"%s\". Please let the user verify his email address."
 msgstr ""
@@ -4755,6 +4799,10 @@ msgstr ""
 msgid "Import %s"
 msgstr ""
 
+#: app/controllers/import_otrs_controller.rb
+msgid "Import API key could not be extracted from URL."
+msgstr ""
+
 #: db/seeds/settings.rb
 msgid "Import Backend"
 msgstr ""
@@ -4933,6 +4981,10 @@ msgstr ""
 msgid "Information"
 msgstr ""
 
+#: app/models/store.rb
+msgid "Inline content could not be generated."
+msgstr ""
+
 #: app/assets/javascripts/app/views/translation/index.jst.eco
 msgid "Inline translation"
 msgstr ""
@@ -5474,6 +5526,15 @@ msgstr ""
 msgid "Load"
 msgstr ""
 
+#: app/assets/javascripts/app/controllers/_integration/smime.coffee
+#: app/assets/javascripts/app/controllers/knowledge_base/search_field_widget.coffee
+#: app/assets/javascripts/app/controllers/ticket_zoom/sidebar_git_issue.coffee
+#: app/assets/javascripts/app/controllers/ticket_zoom/sidebar_idoit.coffee
+#: app/assets/javascripts/app/controllers/widget/payload_example.coffee
+#: app/assets/javascripts/app/models/knowledge_base_answer_translation.coffee
+msgid "Loading failed."
+msgstr ""
+
 #: app/assets/javascripts/app/lib/app_post/task_manager.coffee
 #: app/assets/javascripts/app/lib/base/jquery.textmodule.js
 #: app/assets/javascripts/app/views/generic/page_loading.jst.eco
@@ -7229,6 +7290,10 @@ msgstr ""
 msgid "Priority Icons in Overviews"
 msgstr ""
 
+#: lib/secure_mailing/smime/incoming.rb
+msgid "Private key for decryption could not be found."
+msgstr ""
+
 #: db/seeds/object_manager_attributes.rb
 msgid "Problem"
 msgstr ""
@@ -7699,6 +7764,10 @@ msgstr ""
 msgid "SMS successfully sent"
 msgstr ""
 
+#: app/assets/javascripts/app/controllers/_channel/sms.coffee
+msgid "SMS test failed."
+msgstr ""
+
 #: lib/email_helper.rb
 msgid "SMTP - configure your own outgoing SMTP settings"
 msgstr ""
@@ -7767,6 +7836,13 @@ msgstr ""
 msgid "Saved conditions"
 msgstr ""
 
+#: app/assets/javascripts/app/controllers/_integration/github.coffee
+#: app/assets/javascripts/app/controllers/_integration/gitlab.coffee
+#: app/assets/javascripts/app/controllers/_integration/idoit.coffee
+#: app/assets/javascripts/app/controllers/ticket_zoom.coffee
+msgid "Saving failed."
+msgstr ""
+
 #: app/assets/javascripts/app/controllers/knowledge_base/content_can_be_published_form.coffee
 msgid "Schedule for"
 msgstr ""
@@ -8002,6 +8078,12 @@ msgstr ""
 msgid "Sequencer log level"
 msgstr ""
 
+#: app/assets/javascripts/app/controllers/_integration/exchange.coffee
+#: app/assets/javascripts/app/controllers/_integration/ldap.coffee
+#: app/assets/javascripts/app/controllers/_integration/smime.coffee
+msgid "Server operation failed."
+msgstr ""
+
 #: app/assets/javascripts/app/views/integration/index.jst.eco
 msgid "Service"
 msgstr ""
@@ -8730,6 +8812,10 @@ msgstr ""
 msgid "The MIME type of the resized image is invalid."
 msgstr ""
 
+#: app/assets/javascripts/app/controllers/_channel/telegram.coffee
+msgid "The Telegram bot could not be saved."
+msgstr ""
+
 #: lib/telegram.rb
 msgid "The Telegram file is larger than the allowed 20 MB."
 msgstr ""
@@ -8837,6 +8923,12 @@ msgstr ""
 msgid "The identifier for a ticket, e.g. Ticket#, Call#, MyTicket#. The default is Ticket#."
 msgstr ""
 
+#: app/assets/javascripts/app/controllers/_integration/smime.coffee
+#: app/assets/javascripts/app/controllers/widget/import.coffee
+#: app/assets/javascripts/app/controllers/widget/import_try_result.coffee
+msgid "The import failed."
+msgstr ""
+
 #: app/assets/javascripts/app/views/generic/object_import/imported.jst.eco
 msgid "The import was successful."
 msgstr ""
@@ -8849,6 +8941,10 @@ msgstr ""
 msgid "The installed attachment plugin could not handle the request payload. Ensure that the correct attachment plugin is installed (ingest-attachment)."
 msgstr ""
 
+#: app/assets/javascripts/app/controllers/ticket_zoom/sidebar_git_issue.coffee
+msgid "The issue could not be saved."
+msgstr ""
+
 #: app/assets/javascripts/app/controllers/_application_controller/generic_new.coffee
 #: app/assets/javascripts/app/controllers/_channel/_email_signature.coffee
 #: app/assets/javascripts/app/controllers/agent_ticket_create.coffee
@@ -8882,6 +8978,11 @@ msgstr ""
 msgid "The page you were looking for does not exist."
 msgstr ""
 
+#: app/assets/javascripts/app/controllers/_profile/password.coffee
+#: app/assets/javascripts/app/controllers/password_reset_verify.coffee
+msgid "The password could not be set. Please contact your administrator."
+msgstr ""
+
 #: app/assets/javascripts/app/views/knowledge_base/delete.coffee
 msgid "The request could not be processed."
 msgstr ""
@@ -8898,6 +8999,10 @@ msgstr ""
 msgid "The required parameter 'crc_token' is missing from the Twitter verify payload!"
 msgstr ""
 
+#: app/models/ticket.rb
+msgid "The required parameter 'current_user_id' is missing."
+msgstr ""
+
 #: app/controllers/users_controller.rb
 msgid "The required parameter 'id' is missing."
 msgstr ""
@@ -8914,6 +9019,11 @@ msgstr ""
 msgid "The retried security process failed!"
 msgstr ""
 
+#: app/assets/javascripts/app/controllers/_channel/email.coffee
+#: app/assets/javascripts/app/controllers/getting_started/channel_email.coffee
+msgid "The server settings could not be automatically detected. Please configure them manually."
+msgstr ""
+
 #: app/assets/javascripts/app/controllers/getting_started/admin.coffee
 msgid "The sign-in failed. Please contact the Support team."
 msgstr ""
@@ -8934,6 +9044,19 @@ msgstr ""
 msgid "The text at the beginning of the subject in an email reply, e.g. RE, AW, or AS."
 msgstr ""
 
+#: app/assets/javascripts/app/controllers/agent_ticket_merge.coffee
+msgid "The tickets could not be merged."
+msgstr ""
+
+#: app/controllers/getting_started_controller.rb
+#: app/controllers/settings_controller.rb
+msgid "The uploaded image could not be processed."
+msgstr ""
+
+#: lib/external_credential/microsoft365.rb
+msgid "The user's 'preferred_username' could not be extracted from 'id_token'."
+msgstr ""
+
 #: app/assets/javascripts/app/controllers/customer_ticket_create.coffee
 #: app/assets/javascripts/app/views/customer_not_ticket_exists.jst.eco
 msgid "The way to communicate with us is this thing called \"ticket\"."
@@ -9538,153 +9661,6 @@ msgstr ""
 msgid "URL (AJAX endpoint)"
 msgstr ""
 
-#: app/assets/javascripts/app/views/knowledge_base/base_form.coffee
-msgid "Unable to  save changes"
-msgstr ""
-
-#: app/models/ticket.rb
-msgid "Unable to create article, we only support article.note"
-msgstr ""
-
-#: app/assets/javascripts/app/controllers/getting_started/admin.coffee
-#: app/assets/javascripts/app/controllers/signup.coffee
-msgid "Unable to create user!"
-msgstr ""
-
-#: app/assets/javascripts/app/controllers/ticket_zoom/article_action/delete.coffee
-msgid "Unable to delete article!"
-msgstr ""
-
-#: app/assets/javascripts/app/controllers/knowledge_base/delete_action.coffee
-msgid "Unable to delete."
-msgstr ""
-
-#: app/assets/javascripts/app/controllers/_channel/email.coffee
-#: app/assets/javascripts/app/controllers/getting_started/channel_email.coffee
-msgid "Unable to detect your server settings. Manual configuration needed."
-msgstr ""
-
-#: lib/external_credential/google.rb
-msgid "Unable to extract user email from id_token!"
-msgstr ""
-
-#: lib/external_credential/microsoft365.rb
-msgid "Unable to extract user preferred_username from id_token!"
-msgstr ""
-
-#: lib/secure_mailing/smime/incoming.rb
-msgid "Unable to find certificate for verification"
-msgstr ""
-
-#: lib/secure_mailing/smime/incoming.rb
-msgid "Unable to find private key to decrypt"
-msgstr ""
-
-#: app/models/store.rb
-msgid "Unable to generate inline"
-msgstr ""
-
-#: app/models/store.rb
-msgid "Unable to generate preview"
-msgstr ""
-
-#: app/controllers/import_otrs_controller.rb
-msgid "Unable to get key from URL!"
-msgstr ""
-
-#: app/assets/javascripts/app/controllers/_integration/smime.coffee
-#: app/assets/javascripts/app/controllers/widget/import.coffee
-#: app/assets/javascripts/app/controllers/widget/import_try_result.coffee
-msgid "Unable to import!"
-msgstr ""
-
-#: app/assets/javascripts/app/controllers/knowledge_base/search_field_widget.coffee
-#: app/assets/javascripts/app/models/knowledge_base_answer_translation.coffee
-msgid "Unable to load"
-msgstr ""
-
-#: app/assets/javascripts/app/controllers/idoit_object_selector.coffee
-msgid "Unable to load content"
-msgstr ""
-
-#: app/assets/javascripts/app/controllers/ticket_zoom/sidebar_idoit.coffee
-msgid "Unable to load data…"
-msgstr ""
-
-#: app/assets/javascripts/app/controllers/widget/payload_example.coffee
-msgid "Unable to load example payload!"
-msgstr ""
-
-#: app/assets/javascripts/app/controllers/ticket_zoom/sidebar_git_issue.coffee
-msgid "Unable to load issues"
-msgstr ""
-
-#: app/assets/javascripts/app/controllers/_integration/smime.coffee
-msgid "Unable to load list of certificates!"
-msgstr ""
-
-#: app/assets/javascripts/app/controllers/agent_ticket_merge.coffee
-msgid "Unable to merge!"
-msgstr ""
-
-#: app/assets/javascripts/app/controllers/_integration/exchange.coffee
-#: app/assets/javascripts/app/controllers/_integration/ldap.coffee
-msgid "Unable to perform backend."
-msgstr ""
-
-#: app/assets/javascripts/app/controllers/_channel/sms.coffee
-msgid "Unable to perform test"
-msgstr ""
-
-#: app/controllers/getting_started_controller.rb
-#: app/controllers/settings_controller.rb
-msgid "Unable to process image upload."
-msgstr ""
-
-#: app/assets/javascripts/app/controllers/_channel/telegram.coffee
-msgid "Unable to save Bot."
-msgstr ""
-
-#: app/assets/javascripts/app/controllers/ticket_zoom/sidebar_git_issue.coffee
-msgid "Unable to save issue"
-msgstr ""
-
-#: app/assets/javascripts/app/controllers/_integration/github.coffee
-#: app/assets/javascripts/app/controllers/_integration/gitlab.coffee
-#: app/assets/javascripts/app/controllers/_integration/idoit.coffee
-#: app/assets/javascripts/app/controllers/_integration/smime.coffee
-msgid "Unable to save!"
-msgstr ""
-
-#: app/assets/javascripts/app/controllers/_profile/password.coffee
-#: app/assets/javascripts/app/controllers/password_reset_verify.coffee
-msgid "Unable to set password. Please contact your administrator."
-msgstr ""
-
-#: app/assets/javascripts/app/controllers/ticket_zoom.coffee
-msgid "Unable to update!"
-msgstr ""
-
-#: app/models/ticket.rb
-msgid "Unable to use current_user, got no current_user_id for ticket.perform_changes"
-msgstr ""
-
-#: app/assets/javascripts/app/controllers/_channel/facebook.coffee
-#: app/assets/javascripts/app/controllers/_channel/google.coffee
-#: app/assets/javascripts/app/controllers/_channel/microsoft365.coffee
-#: app/assets/javascripts/app/controllers/_channel/twitter.coffee
-msgid "Unable to verify App."
-msgstr ""
-
-#: app/assets/javascripts/app/controllers/email_verify.coffee
-msgid "Unable to verify email. Please contact your administrator."
-msgstr ""
-
-#: app/assets/javascripts/app/controllers/_channel/email.coffee
-#: app/assets/javascripts/app/controllers/getting_started/channel_email.coffee
-msgid "Unable to verify sending and receiving. Please check your settings."
-msgstr ""
-
 #: app/controllers/first_steps_controller.rb
 #: db/seeds/overviews.rb
 msgid "Unassigned & Open"
@@ -9955,6 +9931,15 @@ msgstr ""
 msgid "User assignment to telephones to be able to open new ticket screen upon answering a call."
 msgstr ""
 
+#: app/assets/javascripts/app/controllers/getting_started/admin.coffee
+#: app/assets/javascripts/app/controllers/signup.coffee
+msgid "User could not be created."
+msgstr ""
+
+#: lib/external_credential/google.rb
+msgid "User email could not be extracted from 'id_token'."
+msgstr ""
+
 #: db/seeds/settings.rb
 msgid "User email for muliple users"
 msgstr ""
diff --git a/lib/external_credential/google.rb b/lib/external_credential/google.rb
index e28f19d20..2d11b623c 100644
--- a/lib/external_credential/google.rb
+++ b/lib/external_credential/google.rb
@@ -41,7 +41,7 @@ class ExternalCredential::Google
     end
 
     user_data = user_info(response[:id_token])
-    raise Exceptions::UnprocessableEntity, __('Unable to extract user email from id_token!') if user_data[:email].blank?
+    raise Exceptions::UnprocessableEntity, __("User email could not be extracted from 'id_token'.") if user_data[:email].blank?
 
     channel_options = {
       inbound:  {
diff --git a/lib/external_credential/microsoft365.rb b/lib/external_credential/microsoft365.rb
index 0da4f3e23..b2417ead5 100644
--- a/lib/external_credential/microsoft365.rb
+++ b/lib/external_credential/microsoft365.rb
@@ -45,7 +45,7 @@ class ExternalCredential::Microsoft365
     end
 
     user_data = user_info(response[:id_token])
-    raise Exceptions::UnprocessableEntity, __('Unable to extract user preferred_username from id_token!') if user_data[:preferred_username].blank?
+    raise Exceptions::UnprocessableEntity, __("The user's 'preferred_username' could not be extracted from 'id_token'.") if user_data[:preferred_username].blank?
 
     channel_options = {
       inbound:  {
diff --git a/lib/secure_mailing/smime/incoming.rb b/lib/secure_mailing/smime/incoming.rb
index 82158a025..8257b8c01 100644
--- a/lib/secure_mailing/smime/incoming.rb
+++ b/lib/secure_mailing/smime/incoming.rb
@@ -73,7 +73,7 @@ class SecureMailing::SMIME::Incoming < SecureMailing::Backend::Handler
     return if !smime?
 
     success = false
-    comment = __('Unable to find private key to decrypt')
+    comment = __('Private key for decryption could not be found.')
     ::SMIMECertificate.where.not(private_key: [nil, '']).find_each do |cert|
       key = OpenSSL::PKey::RSA.new(cert.private_key, cert.private_key_secret)
 
@@ -106,7 +106,7 @@ class SecureMailing::SMIME::Incoming < SecureMailing::Backend::Handler
     return if !signed?
 
     success = false
-    comment = __('Unable to find certificate for verification')
+    comment = __('Certificate for verification could not be found.')
 
     result = verify_certificate_chain(verify_sign_p7enc.certificates)
     if result.present?
diff --git a/spec/lib/secure_mailing/smime_spec.rb b/spec/lib/secure_mailing/smime_spec.rb
index 08b7ff3cf..1012cfb57 100644
--- a/spec/lib/secure_mailing/smime_spec.rb
+++ b/spec/lib/secure_mailing/smime_spec.rb
@@ -327,7 +327,7 @@ RSpec.describe SecureMailing::SMIME do
         it 'fails' do
           expect(mail[:body]).to include(raw_body)
           expect(mail['x-zammad-article-preferences'][:security][:sign][:success]).to be false
-          expect(mail['x-zammad-article-preferences'][:security][:sign][:comment]).to eq('Unable to find certificate for verification')
+          expect(mail['x-zammad-article-preferences'][:security][:sign][:comment]).to eq('Certificate for verification could not be found.')
           expect(mail['x-zammad-article-preferences'][:security][:encryption][:success]).to be false
           expect(mail['x-zammad-article-preferences'][:security][:encryption][:comment]).to be nil
         end
@@ -342,7 +342,7 @@ RSpec.describe SecureMailing::SMIME do
             it 'fails' do
               expect(mail[:body]).to include(raw_body)
               expect(mail['x-zammad-article-preferences'][:security][:sign][:success]).to be false
-              expect(mail['x-zammad-article-preferences'][:security][:sign][:comment]).to eq('Unable to find certificate for verification')
+              expect(mail['x-zammad-article-preferences'][:security][:sign][:comment]).to eq('Certificate for verification could not be found.')
               expect(mail['x-zammad-article-preferences'][:security][:encryption][:success]).to be false
               expect(mail['x-zammad-article-preferences'][:security][:encryption][:comment]).to be nil
             end
@@ -356,7 +356,7 @@ RSpec.describe SecureMailing::SMIME do
               it 'fails' do
                 expect(mail[:body]).to include(raw_body)
                 expect(mail['x-zammad-article-preferences'][:security][:sign][:success]).to be false
-                expect(mail['x-zammad-article-preferences'][:security][:sign][:comment]).to eq('Unable to find certificate for verification')
+                expect(mail['x-zammad-article-preferences'][:security][:sign][:comment]).to eq('Certificate for verification could not be found.')
                 expect(mail['x-zammad-article-preferences'][:security][:encryption][:success]).to be false
                 expect(mail['x-zammad-article-preferences'][:security][:encryption][:comment]).to be nil
               end
@@ -375,7 +375,7 @@ RSpec.describe SecureMailing::SMIME do
             it "won't perform verification" do
               expect(mail[:body]).to include(raw_body)
               expect(mail['x-zammad-article-preferences'][:security][:sign][:success]).to be false
-              expect(mail['x-zammad-article-preferences'][:security][:sign][:comment]).to eq('Unable to find certificate for verification')
+              expect(mail['x-zammad-article-preferences'][:security][:sign][:comment]).to eq('Certificate for verification could not be found.')
               expect(mail['x-zammad-article-preferences'][:security][:encryption][:success]).to be false
               expect(mail['x-zammad-article-preferences'][:security][:encryption][:comment]).to be nil
             end
@@ -406,7 +406,7 @@ RSpec.describe SecureMailing::SMIME do
             it 'fails' do
               expect(mail[:body]).to include(raw_body)
               expect(mail['x-zammad-article-preferences'][:security][:sign][:success]).to be false
-              expect(mail['x-zammad-article-preferences'][:security][:sign][:comment]).to eq('Unable to find certificate for verification')
+              expect(mail['x-zammad-article-preferences'][:security][:sign][:comment]).to eq('Certificate for verification could not be found.')
               expect(mail['x-zammad-article-preferences'][:security][:encryption][:success]).to be false
               expect(mail['x-zammad-article-preferences'][:security][:encryption][:comment]).to be nil
             end
@@ -421,7 +421,7 @@ RSpec.describe SecureMailing::SMIME do
               it 'fails' do
                 expect(mail[:body]).to include(raw_body)
                 expect(mail['x-zammad-article-preferences'][:security][:sign][:success]).to be false
-                expect(mail['x-zammad-article-preferences'][:security][:sign][:comment]).to eq('Unable to find certificate for verification')
+                expect(mail['x-zammad-article-preferences'][:security][:sign][:comment]).to eq('Certificate for verification could not be found.')
                 expect(mail['x-zammad-article-preferences'][:security][:encryption][:success]).to be false
                 expect(mail['x-zammad-article-preferences'][:security][:encryption][:comment]).to be nil
               end
@@ -446,7 +446,7 @@ RSpec.describe SecureMailing::SMIME do
             it 'fails' do
               expect(mail[:body]).to include(raw_body)
               expect(mail['x-zammad-article-preferences'][:security][:sign][:success]).to be false
-              expect(mail['x-zammad-article-preferences'][:security][:sign][:comment]).to eq('Unable to find certificate for verification')
+              expect(mail['x-zammad-article-preferences'][:security][:sign][:comment]).to eq('Certificate for verification could not be found.')
               expect(mail['x-zammad-article-preferences'][:security][:encryption][:success]).to be false
               expect(mail['x-zammad-article-preferences'][:security][:encryption][:comment]).to be nil
             end
@@ -573,7 +573,7 @@ RSpec.describe SecureMailing::SMIME do
           expect(mail['x-zammad-article-preferences'][:security][:sign][:success]).to be false
           expect(mail['x-zammad-article-preferences'][:security][:sign][:comment]).to be nil
           expect(mail['x-zammad-article-preferences'][:security][:encryption][:success]).to be false
-          expect(mail['x-zammad-article-preferences'][:security][:encryption][:comment]).to eq('Unable to find private key to decrypt')
+          expect(mail['x-zammad-article-preferences'][:security][:encryption][:comment]).to eq('Private key for decryption could not be found.')
         end
 
         it_behaves_like 'HttpLog writer', 'failed'
diff --git a/spec/models/store_spec.rb b/spec/models/store_spec.rb
index 03b15c81e..7e29db664 100644
--- a/spec/models/store_spec.rb
+++ b/spec/models/store_spec.rb
@@ -234,10 +234,10 @@ RSpec.describe Store, type: :model do
 
           it 'cannot be resized (neither inlined nor previewed)' do
             expect { store.content_inline }
-              .to raise_error('Unable to generate inline')
+              .to raise_error('Inline content could not be generated.')
 
             expect { store.content_preview }
-              .to raise_error('Unable to generate preview')
+              .to raise_error('Content preview could not be generated.')
 
             expect(store.preferences)
               .to not_include(resizable: true)
@@ -254,10 +254,10 @@ RSpec.describe Store, type: :model do
 
           it 'cannot be resized (neither inlined nor previewed)' do
             expect { store.content_inline }
-              .to raise_error('Unable to generate inline')
+              .to raise_error('Inline content could not be generated.')
 
             expect { store.content_preview }
-              .to raise_error('Unable to generate preview')
+              .to raise_error('Content preview could not be generated.')
 
             expect(store.preferences)
               .to not_include(resizable: true)
@@ -273,10 +273,10 @@ RSpec.describe Store, type: :model do
 
             it 'cannot be resized (neither inlined nor previewed)' do
               expect { store.content_inline }
-                .to raise_error('Unable to generate inline')
+                .to raise_error('Inline content could not be generated.')
 
               expect { store.content_preview }
-                .to raise_error('Unable to generate preview')
+                .to raise_error('Content preview could not be generated.')
 
               expect(store.preferences)
                 .to not_include(resizable: true)
@@ -291,7 +291,7 @@ RSpec.describe Store, type: :model do
 
             it 'can be resized (previewed but not inlined)' do
               expect { store.content_inline }
-                .to raise_error('Unable to generate inline')
+                .to raise_error('Inline content could not be generated.')
 
               expect(resized_preview_image.width).to eq(200)
 
@@ -335,10 +335,10 @@ RSpec.describe Store, type: :model do
 
               it 'cannot be resized (neither inlined nor previewed)' do
                 expect { store.content_inline }
-                  .to raise_error('Unable to generate inline')
+                  .to raise_error('Inline content could not be generated.')
 
                 expect { store.content_preview }
-                  .to raise_error('Unable to generate preview')
+                  .to raise_error('Content preview could not be generated.')
 
                 expect(store.preferences)
                   .to not_include(resizable: true)
@@ -352,10 +352,10 @@ RSpec.describe Store, type: :model do
 
               it 'cannot be resized (neither inlined nor previewed)' do
                 expect { store.content_inline }
-                  .to raise_error('Unable to generate inline')
+                  .to raise_error('Inline content could not be generated.')
 
                 expect { store.content_preview }
-                  .to raise_error('Unable to generate preview')
+                  .to raise_error('Content preview could not be generated.')
 
                 expect(store.preferences)
                   .to not_include(resizable: true)
diff --git a/spec/system/channels/email_spec.rb b/spec/system/channels/email_spec.rb
index 0d9674d3f..61e52b813 100644
--- a/spec/system/channels/email_spec.rb
+++ b/spec/system/channels/email_spec.rb
@@ -50,7 +50,7 @@ RSpec.describe 'Manage > Channels > Email', type: :system do
           fill_in 'password', with: mailbox_password
           select 'Users', from: 'group_id'
           click '.js-submit'
-          expect(page).to have_text('Unable to detect your server settings. Manual configuration needed.')
+          expect(page).to have_text('The server settings could not be automatically detected. Please configure them manually.')
         end
 
       end