diff --git a/app/assets/javascripts/app/lib/app_post/auth.js.coffee b/app/assets/javascripts/app/lib/app_post/auth.js.coffee
index 1dac8ef8e..5ffb3093c 100644
--- a/app/assets/javascripts/app/lib/app_post/auth.js.coffee
+++ b/app/assets/javascripts/app/lib/app_post/auth.js.coffee
@@ -61,14 +61,13 @@ class App.Auth
       for key, value of data.config
         App.Config.set( key, value )
 
+      # refresh default collections
+      if data.collections
+        App.Collection.resetCollections( data.collections )
+
       # empty session
       App.Session.init()
 
-      # rebuild navbar with new navbar items
-      App.Event.trigger( 'auth' )
-      App.Event.trigger( 'auth:logout' )
-      App.Event.trigger( 'ui:rerender' )
-
       # update model definition
       if data.models
         for model, attributes of data.models
@@ -76,6 +75,15 @@ class App.Auth
             App[model].attributes.push attribute.name
             App[model].configure_attributes.push attribute
 
+      # set locale
+      locale = window.navigator.userLanguage || window.navigator.language || 'en-us'
+      App.i18n.set( locale )
+
+      # rebuild navbar with new navbar items
+      App.Event.trigger( 'auth' )
+      App.Event.trigger( 'auth:logout' )
+      App.Event.trigger( 'ui:rerender' )
+
       return false;
 
     # clear local store
diff --git a/app/assets/javascripts/app/lib/app_post/i18n.js.coffee b/app/assets/javascripts/app/lib/app_post/i18n.js.coffee
index 0a9eec249..8f7dc91b7 100644
--- a/app/assets/javascripts/app/lib/app_post/i18n.js.coffee
+++ b/app/assets/javascripts/app/lib/app_post/i18n.js.coffee
@@ -124,21 +124,33 @@ class _i18nSingleton extends Spine.Module
     @locale
 
   set: ( locale ) ->
-    if locale is 'en'
-      locale = 'en-us'
-    @locale = locale
+
+    # prepare locale
+    localeToSet = locale.toLowerCase()
+
+    # try aliases
+    locales = App.Locale.all()
+    for locale in locales
+      if locale.alias is locale
+        localeToSet = locale.locale
+
+    # check if locale need to be changed
+    return if localeToSet is @locale
+
+    # set locale
+    @locale = localeToSet
 
     # set if not translated should be logged
-    @_notTranslatedLog = @notTranslatedFeatureEnabled(locale)
+    @_notTranslatedLog = @notTranslatedFeatureEnabled(@locale)
 
     # set lang attribute of html tag
-    $('html').prop( 'lang', locale.substr(0, 2) )
+    $('html').prop( 'lang', @locale.substr(0, 2) )
 
     @mapString = {}
     App.Ajax.request(
-      id:    'i18n-set-' + locale,
+      id:    'i18n-set-' + @locale,
       type:   'GET',
-      url:    App.Config.get('api_path') + '/translations/lang/' + locale,
+      url:    App.Config.get('api_path') + '/translations/lang/' + @locale,
       async:  false,
       success: (data, status, xhr) =>
 
diff --git a/app/controllers/sessions_controller.rb b/app/controllers/sessions_controller.rb
index df2b9aec4..75acdd1d7 100644
--- a/app/controllers/sessions_controller.rb
+++ b/app/controllers/sessions_controller.rb
@@ -90,6 +90,9 @@ class SessionsController < ApplicationController
         error: 'no valid session',
         config: config_frontend,
         models: models,
+        collections: {
+          Locale.to_app_model => Locale.where( active: true )
+        }
       }
       return
     end