Use the locale cookie to set the language

#7617

(cherry picked from commit e8403e3)

Author: garethbowen

admin/src/js/controllers/main.js

@@ -3,11 +3,12 @@ angular.module('controllers').controller('MainCtrl',
     $log,
     $scope,
     $state,
-    $translate,
     $window,
     Auth,
+    Language,
     Location,
-    Session
+    Session,
+    SetLanguage
   ) {
     'ngInject';
 
@@ -23,7 +24,7 @@ angular.module('controllers').controller('MainCtrl',
         });
     };   
 
-    $translate.use('en');
+    Language().then(locale => SetLanguage(locale));
     $scope.authorized = false;
     $scope.navbarCollapsed = true;
     Auth.any([['can_configure'], ['can_view_outgoing_messages'], ['can_export_all']])

admin/src/js/services/language.js

@@ -24,16 +24,8 @@ const moment = require('moment');
       SetLanguageCookie
     ) {
       'ngInject';
-      
-      const setDatepickerLanguage = function(language) {
-        const availableCalendarLanguages = Object.keys($.fn.datepicker.dates);
-        const calendarLanguage = availableCalendarLanguages.indexOf(language) >= 0 ? language : 'en';
-        $.fn.datepicker.defaults.language = calendarLanguage;
-      };
-
       return function(code, setLanguageCookie) {
         moment.locale([code, 'en']);
-        setDatepickerLanguage(code);
         $translate.use(code);
 
         if (setLanguageCookie !== false) {