diff --git a/app/assets/javascripts/app/controllers/_profile/language.js.coffee b/app/assets/javascripts/app/controllers/_profile/language.js.coffee
index 70aae6ec2..6a4869c8c 100644
--- a/app/assets/javascripts/app/controllers/_profile/language.js.coffee
+++ b/app/assets/javascripts/app/controllers/_profile/language.js.coffee
@@ -50,7 +50,6 @@ class Index extends App.Controller
       =>
         App.i18n.set( @locale )
         App.Event.trigger( 'ui:rerender' )
-        App.Event.trigger( 'ui:page:rerender' )
         @notify(
           type: 'success'
           msg:  App.i18n.translateContent( 'Successfully!' )
diff --git a/app/assets/javascripts/app/controllers/_profile/notification.js.coffee b/app/assets/javascripts/app/controllers/_profile/notification.js.coffee
index 25e0159d1..112707ba7 100644
--- a/app/assets/javascripts/app/controllers/_profile/notification.js.coffee
+++ b/app/assets/javascripts/app/controllers/_profile/notification.js.coffee
@@ -129,7 +129,6 @@ class Index extends App.Controller
       App.Session.get( 'id' ),
       =>
         App.Event.trigger( 'ui:rerender' )
-        App.Event.trigger( 'ui:page:rerender' )
         @notify(
           type: 'success'
           msg:  App.i18n.translateContent( 'Successfully!' )
diff --git a/app/assets/javascripts/app/controllers/agent_ticket_create.js.coffee b/app/assets/javascripts/app/controllers/agent_ticket_create.js.coffee
index b993aa514..5241b747d 100644
--- a/app/assets/javascripts/app/controllers/agent_ticket_create.js.coffee
+++ b/app/assets/javascripts/app/controllers/agent_ticket_create.js.coffee
@@ -37,6 +37,11 @@ class App.TicketCreate extends App.Controller
       @log 'notice', 'error', defaults
       @render(defaults)
 
+    # rerender view, e. g. on langauge change
+    @bind 'ui:rerender', =>
+      return if !@authenticate(true)
+      @render()
+
   changeFormType: (e) =>
     type = $(e.target).data('type')
     if !type
diff --git a/app/assets/javascripts/app/controllers/dashboard.js.coffee b/app/assets/javascripts/app/controllers/dashboard.js.coffee
index 6a69bb761..5c933c2e6 100644
--- a/app/assets/javascripts/app/controllers/dashboard.js.coffee
+++ b/app/assets/javascripts/app/controllers/dashboard.js.coffee
@@ -53,6 +53,11 @@ class App.Dashboard extends App.Controller
     # render page
     @render()
 
+    # rerender view, e. g. on langauge change
+    @bind 'ui:rerender', =>
+      return if !@authenticate(true)
+      @render()
+
   render: ->
 
     @html App.view('dashboard')(
@@ -83,7 +88,7 @@ class App.Dashboard extends App.Controller
 
   renderWidgetClockFace: (time) =>
     canvas = @el.find 'canvas'
-    ctx = canvas.get(0).getContext '2d'
+    ctx    = canvas.get(0).getContext '2d'
     radius = 26
 
     @el.find('.time.stat-widget .stat-amount').text time
diff --git a/app/assets/javascripts/app/controllers/navigation.js.coffee b/app/assets/javascripts/app/controllers/navigation.js.coffee
index 58cb9c5f2..90e33563d 100644
--- a/app/assets/javascripts/app/controllers/navigation.js.coffee
+++ b/app/assets/javascripts/app/controllers/navigation.js.coffee
@@ -5,7 +5,7 @@ class App.Navigation extends App.Controller
     super
     @render()
 
-    # rerender view
+    # rerender view, e. g. on langauge change
     @bind 'ui:rerender', (data) =>
       @renderMenu()
       @renderPersonal()
diff --git a/app/assets/javascripts/app/controllers/organization_profile.js.coffee b/app/assets/javascripts/app/controllers/organization_profile.js.coffee
index 9e0449e6b..390ed6b66 100644
--- a/app/assets/javascripts/app/controllers/organization_profile.js.coffee
+++ b/app/assets/javascripts/app/controllers/organization_profile.js.coffee
@@ -7,11 +7,14 @@ class App.OrganizationProfile extends App.Controller
       App.TaskManager.remove( @task_key )
       return
 
-    @navupdate '#'
-
     # fetch new data if needed
     App.Organization.full( @organization_id, @render )
 
+    # rerender view, e. g. on langauge change
+    @bind 'ui:rerender', =>
+      return if !@authenticate(true)
+      @render( App.Organization.fullLocal( @organization_id ) )
+
   meta: =>
     meta =
       url: @url()
diff --git a/app/assets/javascripts/app/controllers/ticket_overview.js.coffee b/app/assets/javascripts/app/controllers/ticket_overview.js.coffee
index 9d2997eb5..91e0dd767 100644
--- a/app/assets/javascripts/app/controllers/ticket_overview.js.coffee
+++ b/app/assets/javascripts/app/controllers/ticket_overview.js.coffee
@@ -102,6 +102,11 @@ class Table extends App.Controller
     @bind 'ticket_overview_local', =>
       @render(true)
 
+    # rerender view, e. g. on langauge change
+    @bind 'ui:rerender', =>
+      return if !@authenticate(true)
+      @render()
+
   update: (params) =>
     for key, value of params
       @[key] = value
diff --git a/app/assets/javascripts/app/controllers/ticket_zoom.js.coffee b/app/assets/javascripts/app/controllers/ticket_zoom.js.coffee
index 54dbaae29..64114788c 100644
--- a/app/assets/javascripts/app/controllers/ticket_zoom.js.coffee
+++ b/app/assets/javascripts/app/controllers/ticket_zoom.js.coffee
@@ -53,6 +53,11 @@ class App.TicketZoom extends App.Controller
             @delay( update, 1800, 'ticket-zoom-' + @ticket_id )
     )
 
+    # rerender view, e. g. on langauge change
+    @bind 'ui:rerender', =>
+      return if !@authenticate(true)
+      @render(true)
+
   meta: =>
 
     # default attributes
@@ -239,7 +244,7 @@ class App.TicketZoom extends App.Controller
     App.Event.trigger 'task:render'
     @formEnable( @$('.submit') )
 
-    if !@renderDone
+    if force || !@renderDone
       @renderDone = true
       @html App.view('ticket_zoom')(
         ticket:     @ticket
diff --git a/app/assets/javascripts/app/controllers/user_profile.js.coffee b/app/assets/javascripts/app/controllers/user_profile.js.coffee
index d8896a41a..f5826e88b 100644
--- a/app/assets/javascripts/app/controllers/user_profile.js.coffee
+++ b/app/assets/javascripts/app/controllers/user_profile.js.coffee
@@ -7,11 +7,14 @@ class App.UserProfile extends App.Controller
       App.TaskManager.remove( @task_key )
       return
 
-    @navupdate '#'
-
     # fetch new data if needed
     @subscribeId = App.User.full( @user_id, @render )
 
+    # rerender view, e. g. on langauge change
+    @bind 'ui:rerender', =>
+      return if !@authenticate(true)
+      @render( App.User.fullLocal( @user_id ) )
+
   release: =>
     App.User.unsubscribe(@subscribeId)
 
diff --git a/app/assets/javascripts/app/lib/app_post/interface_handle.js.coffee b/app/assets/javascripts/app/lib/app_post/interface_handle.js.coffee
index df50eba05..1d896b6b0 100644
--- a/app/assets/javascripts/app/lib/app_post/interface_handle.js.coffee
+++ b/app/assets/javascripts/app/lib/app_post/interface_handle.js.coffee
@@ -91,13 +91,6 @@ class App.Content extends App.Controller
             new callback( params )
           controller( params )
 
-          # rerender view on ui:rerender event
-          App.Event.bind(
-            'ui:page:rerender', =>
-              controller( params )
-            'page'
-          )
-
           # scroll to top / remember last screen position
 #          @scrollTo( 0, 0, 100 )
         )
diff --git a/app/assets/javascripts/app/lib/app_post/task_manager.js.coffee b/app/assets/javascripts/app/lib/app_post/task_manager.js.coffee
index 088af5e25..2c662b75d 100644
--- a/app/assets/javascripts/app/lib/app_post/task_manager.js.coffee
+++ b/app/assets/javascripts/app/lib/app_post/task_manager.js.coffee
@@ -68,19 +68,13 @@ class _taskManagerSingleton extends Spine.Module
       @el = params.el
     else
       @el = $('#app')
-    @offlineModus      = params.offlineModus
-    @workers           = {}
-    @workersStarted    = {}
-    @allTasks          = []
-    @tasksToUpdate     = {}
-    @activeTaskHistory = []
+    @offlineModus = params.offlineModus
     @tasksInitial()
 
     # render on login
     App.Event.bind(
       'auth:login'
       =>
-        @reset()
         @tasksInitial()
       'task'
     )
@@ -96,6 +90,14 @@ class _taskManagerSingleton extends Spine.Module
     # send updates to server
     App.Interval.set( @taskUpdateLoop, 2500, 'check_update_to_server_pending', 'task' )
 
+  init: ->
+    @workers           = {}
+    @workersStarted    = {}
+    @tasksStarted      = {}
+    @allTasks          = []
+    @tasksToUpdate     = {}
+    @activeTaskHistory = []
+
   all: ->
 
     # sort by prio
@@ -125,6 +127,12 @@ class _taskManagerSingleton extends Spine.Module
     # input validation
     params.key = App.Utils.htmlAttributeCleanup(params.key)
 
+    # remember started task / prevent to open task twice
+    createNewTask = true
+    if @tasksStarted[params.key]
+      createNewTask = false
+    @tasksStarted[params.key] = true
+
     # if we have init task startups, let the controller know this
     if params.init
       params.params.init = true
@@ -138,13 +146,14 @@ class _taskManagerSingleton extends Spine.Module
     if params.show
       @activeTaskHistory.push _.clone(params)
 
-    # create new task if not exists
+    # check if task already exists in storage / e. g. from last session
     task = @get( params.key )
+
     #console.log 'debug', 'execute', params, 'task', task
 
     # create new online task if not exists and if not persistent
-    if !task && !params.persistent
-      @log 'debug', 'add, create new taskbar in backend'
+    if !task && createNewTask && !params.persistent
+      #console.log 'debug', 'add, create new taskbar in backend'
       task = new App.Taskbar
       task.load(
         key:      params.key
@@ -286,6 +295,10 @@ class _taskManagerSingleton extends Spine.Module
 
   # remove task certain task from tasks
   remove: ( key ) =>
+
+    # remember started task
+    delete @tasksStarted[key]
+
     task = @get( key )
     return if !task
 
@@ -337,6 +350,7 @@ class _taskManagerSingleton extends Spine.Module
 
     delete @workersStarted[ key ]
     delete @workers[ key ]
+    delete @tasksStarted[ key ]
 
   # reset while tasks
   reset: =>
@@ -350,9 +364,7 @@ class _taskManagerSingleton extends Spine.Module
       @release(key)
 
     # clear instance vars
-    @tasksToUpdate     = {}
-    @allTasks          = []
-    @activeTaskHistory = []
+    @init()
 
     # clear in mem tasks
     App.Taskbar.deleteAll()
@@ -434,10 +446,10 @@ class _taskManagerSingleton extends Spine.Module
     return
 
   tasksInitial: =>
+    @init()
 
     # set taskbar collection stored in database
-    tasks     = App.Taskbar.all()
-    @allTasks = []
+    tasks = App.Taskbar.all()
     for task in tasks
       @allTasks.push task.attributes()
 
diff --git a/app/assets/javascripts/app/views/dashboard.jst.eco b/app/assets/javascripts/app/views/dashboard.jst.eco
index 07d1f6902..d1c962f43 100644
--- a/app/assets/javascripts/app/views/dashboard.jst.eco
+++ b/app/assets/javascripts/app/views/dashboard.jst.eco
@@ -1,8 +1,8 @@
 <div class="dashboard main flex center">
   <div class="tabs wide-tabs horizontal">
-    <div class="tab my-stats active">My Stats</div>
-    <div class="tab my-groups">My Group</div>
-    <div class="tab all-stats">All</div>
+    <div class="tab my-stats active"><%- @T('My Stats') %></div>
+    <div class="tab my-groups"><%- @T('My Group') %></div>
+    <div class="tab all-stats"><%- @T('All') %></div>
   </div>
 
   <div class="stat-widgets three-columns horizontal">
diff --git a/test/browser/prefereces_test.rb b/test/browser/prefereces_test.rb
index f0db3455c..2f4a03ea4 100644
--- a/test/browser/prefereces_test.rb
+++ b/test/browser/prefereces_test.rb
@@ -5,10 +5,43 @@ class PreferencesTest < TestCase
   def test_preferences
     @browser = browser_instance
     login(
-      :username => 'nicole.braun@zammad.org',
+      :username => 'master@example.com',
       :password => 'test',
       :url      => browser_url,
     )
+    tasks_close_all()
+
+    # start ticket create
+    ticket_create(
+      :data => {
+        :customer => 'nicole',
+        :group    => 'Users',
+        :title    => 'preferences lang check #1',
+        :body     => 'preferences lang check #1',
+      },
+      :do_not_submit => true,
+    )
+
+    # start ticket zoom
+    ticket = ticket_create(
+      :data => {
+        :customer => 'nicole',
+        :group    => 'Users',
+        :title    => 'preferences lang check #2',
+        :body     => 'preferences lang check #2',
+      },
+    )
+
+    # start user profile
+    user_open_by_search(
+      :value => 'Nicole',
+    )
+
+    # start organization profile
+    organization_open_by_search(
+      :value => 'Zammad Foundation',
+    )
+
     click( :css => 'a[href="#current_user"]' )
     click( :css => 'a[href="#profile"]' )
     click( :css => 'a[href="#profile/language"]' )
@@ -21,6 +54,103 @@ class PreferencesTest < TestCase
       :css   => 'body',
       :value => 'Sprache',
     )
+
+    # check language in navbar
+    watch_for(
+      :css   => '#navigation',
+      :value => 'Übersicht'
+    )
+
+    # check language in dashboard
+    click( :css => '#navigation a[href="#dashboard"]' )
+    watch_for(
+      :css   => '.content.active',
+      :value => 'Meine zugewiesenen'
+    )
+
+    # check language in overview
+    click( :css => '#navigation a[href="#ticket/view"]' )
+    watch_for(
+      :css   => '.content.active',
+      :value => 'Meine'
+    )
+    verify_title(
+      :value => 'Meine zugewiesenen',
+    )
+
+    # check language in ticket create
+    verify_task(
+      :data => {
+        :title => 'anruf',
+      }
+    )
+    open_task(
+      :data    => {
+        :title => 'preferences lang check #1',
+      }
+    )
+    watch_for(
+      :css   => '.content.active',
+      :value => 'kunde'
+    )
+    watch_for(
+      :css   => '.content.active',
+      :value => 'priorität'
+    )
+    watch_for(
+      :css   => '.content.active [data-name="body"]',
+      :value => 'preferences lang check #1'
+    )
+    verify_title(
+      :value => 'anruf',
+    )
+
+    # check language in ticket zoom
+    ticket_open_by_search(
+      :number => ticket[:number],
+    )
+    watch_for(
+      :css   => '.content.active',
+      :value => 'erstellt'
+    )
+    watch_for(
+      :css   => '.content.active',
+      :value => 'priorität'
+    )
+
+    # check language in user profile
+    open_task(
+      :data    => {
+        :title => 'Nicole',
+      }
+    )
+    watch_for(
+      :css   => '.content.active',
+      :value => 'notiz'
+    )
+    watch_for(
+      :css   => '.content.active',
+      :value => 'e-mail'
+    )
+    watch_for(
+      :css   => '.content.active',
+      :value => 'aktion'
+    )
+
+    # check language in organization profile
+    open_task(
+      :data    => {
+        :title => 'Zammad',
+      }
+    )
+    watch_for(
+      :css   => '.content.active',
+      :value => 'notiz'
+    )
+
+    click( :css => 'a[href="#current_user"]' )
+    click( :css => 'a[href="#profile"]' )
+    click( :css => 'a[href="#profile/language"]' )
     select(
       :css   => '.language_item select[name="locale"]',
       :value => 'English (United States)',
@@ -31,6 +161,104 @@ class PreferencesTest < TestCase
       :css   => 'body',
       :value => 'Language',
     )
+
+    # check language in navbar
+    watch_for(
+      :css   => '#navigation',
+      :value => 'Overview'
+    )
+
+    # check language in dashboard
+    click( :css => '#navigation a[href="#dashboard"]' )
+    watch_for(
+      :css   => '.content.active',
+      :value => 'My assig'
+    )
+
+    # check language in overview
+    click( :css => '#navigation a[href="#ticket/view"]' )
+    watch_for(
+      :css   => '.content.active',
+      :value => 'My'
+    )
+    verify_title(
+      :value => 'My assig',
+    )
+
+    # check language in ticket create
+    verify_task(
+      :data => {
+        :title => 'call',
+      }
+    )
+    open_task(
+      :data    => {
+        :title => 'preferences lang check #1',
+      }
+    )
+    watch_for(
+      :css   => '.content.active',
+      :value => 'customer'
+    )
+    watch_for(
+      :css   => '.content.active',
+      :value => 'priority'
+    )
+    watch_for(
+      :css   => '.content.active [data-name="body"]',
+      :value => 'preferences lang check #1'
+    )
+    verify_title(
+      :value => 'call',
+    )
+
+    # check language in ticket zoom
+    ticket_open_by_search(
+      :number => ticket[:number],
+    )
+    watch_for(
+      :css   => '.content.active',
+      :value => 'create'
+    )
+    watch_for(
+      :css   => '.content.active',
+      :value => 'priority'
+    )
+
+    # check language in user profile
+    open_task(
+      :data    => {
+        :title => 'Nicole',
+      }
+    )
+    watch_for(
+      :css   => '.content.active',
+      :value => 'note'
+    )
+    watch_for(
+      :css   => '.content.active',
+      :value => 'email'
+    )
+
+    # check language in organization profile
+    open_task(
+      :data    => {
+        :title => 'Zammad',
+      }
+    )
+    watch_for(
+      :css   => '.content.active',
+      :value => 'note'
+    )
+    watch_for(
+      :css   => '.content.active',
+      :value => 'action'
+    )
+
+    # switch to de again
+    click( :css => 'a[href="#current_user"]' )
+    click( :css => 'a[href="#profile"]' )
+    click( :css => 'a[href="#profile/language"]' )
     select(
       :css   => '.language_item select[name="locale"]',
       :value => 'Deutsch',
@@ -41,11 +269,33 @@ class PreferencesTest < TestCase
       :css   => 'body',
       :value => 'Sprache',
     )
-    sleep 2
+    sleep 4
+
+    # check if language is still used after reload
     reload()
     watch_for(
       :css   => 'body',
       :value => 'Sprache',
     )
+
+    # check language in navbar
+    watch_for(
+      :css   => '#navigation',
+      :value => 'Übersicht'
+    )
+
+    # check language in dashboard
+    click( :css => '#navigation a[href="#dashboard"]' )
+    watch_for(
+      :css   => '.content.active',
+      :value => 'Meine'
+    )
+
+    # check language in overview
+    click( :css => '#navigation a[href="#ticket/view"]' )
+    watch_for(
+      :css   => '.content.active',
+      :value => 'Meine'
+    )
   end
 end
\ No newline at end of file
diff --git a/test/browser_test_helper.rb b/test/browser_test_helper.rb
index 748d070d2..2a2564fc0 100644
--- a/test/browser_test_helper.rb
+++ b/test/browser_test_helper.rb
@@ -571,6 +571,29 @@ class TestCase < Test::Unit::TestCase
     true
   end
 
+=begin
+
+  open_task(
+    :browser => browser1,
+    :data    => {
+      :title => 'some title',
+    }
+  )
+
+=end
+
+  def open_task(params = {}, fallback = false)
+    instance = params[:browser] || @browser
+    data     = params[:data]
+
+    element = instance.find_elements( { :partial_link_text => data[:title] } )[0]
+    if !element
+      raise "no task with title '#{data[:title]}' found"
+    end
+    element.click
+    true
+  end
+
 =begin
 
   file_upload(
@@ -614,7 +637,7 @@ class TestCase < Test::Unit::TestCase
     if params[:timeout]
       timeout = params[:timeout]
     end
-    loops = (timeout).to_i
+    loops = (timeout).to_i * 2
     text = ''
     (1..loops).each { |loop|
       element = instance.find_elements( { :css => params[:css] } )[0]
@@ -638,7 +661,7 @@ class TestCase < Test::Unit::TestCase
           # just try again
         end
       end
-      sleep 1
+      sleep 0.5
     }
     raise "'#{params[:value]}' found in '#{text}'"
   end