Respect languages preferences on login page

Fixes #4169

UI/MainUI/SOGoRootPage.m

@@ -72,6 +72,11 @@
 
 /* accessors */
 
+- (NSString *) modulePath
+{
+  return @"";
+}
+
 //- (NSString *) connectURL
 //{
 //  return [NSString stringWithFormat: @"%@/connect", [self applicationPath]];
@@ -525,6 +530,11 @@
   return item;
 }
 
+- (NSString *) language
+{
+  return [[context resourceLookupLanguages] objectAtIndex: 0];
+}
+
 - (NSArray *) languages
 {
   return [[SOGoSystemDefaults sharedSystemDefaults] supportedLanguages];

UI/Templates/MainUI/SOGoRootPage.wox

@@ -11,6 +11,7 @@
     >
   <script type="text/javascript">
     var cookieUsername = '<var:string var:value="cookieUsername" const:escapeHTML="NO"/>';
+    var language = '<var:string var:value="language" const:escapeHTML="NO"/>';
   </script>
 
   <!--
@@ -56,7 +57,7 @@
               <md-icon>language</md-icon>
               <md-input-container class="md-flex">
                 <label><var:string label:value="choose"/></label>
-                <md-select ng-model="app.creds.language">
+                <md-select ng-model="app.creds.language" ng-change="app.changeLanguage($event)">
                   <var:foreach list="languages" item="item">
                     <md-option var:value="item">
                       <var:string value="languageText"/>

UI/WebServerResources/js/Main/Main.app.js

@@ -13,20 +13,21 @@
   function LoginController($scope, $window, $timeout, Dialog, $mdDialog, Authentication) {
     var vm = this;
 
-    vm.creds = {
-      username: $window.cookieUsername,
-      password: null,
-      rememberLogin: angular.isDefined($window.cookieUsername) && $window.cookieUsername.length > 0
+    this.$onInit = function() {
+      this.creds = {
+        username: $window.cookieUsername,
+        password: null,
+        language: $window.language,
+        rememberLogin: angular.isDefined($window.cookieUsername) && $window.cookieUsername.length > 0
+      };
+      this.loginState = false;
+
+      // Show login once everything is initialized
+      this.showLogin = false;
+      $timeout(function() { vm.showLogin = true; }, 100);
     };
-    vm.login = login;
-    vm.loginState = false;
-    vm.showAbout = showAbout;
 
-    // Show login once everything is initialized
-    vm.showLogin = false;
-    $timeout(function() { vm.showLogin = true; }, 100);
-
-    function login() {
+    this.login = function() {
       vm.loginState = 'authenticating';
       Authentication.login(vm.creds)
         .then(function(data) {
@@ -45,9 +46,9 @@
           vm.errorMessage = msg.error;
         });
       return false;
-    }
+    };
 
-    function showAbout($event) {
+    this.showAbout = function($event) {
       $mdDialog.show({
         targetEvent: $event,
         templateUrl: 'aboutBox.html',
@@ -60,7 +61,12 @@
           $mdDialog.hide();
         };
       }
-    }
+    };
+
+    this.changeLanguage = function($event) {
+      // Reload page
+      $window.location.href = ApplicationBaseURL + 'login?language=' + this.creds.language;
+    };
   }
 
   angular