(js) Set locale to CKEditor in Mail editor

UI/Templates/MailerUI/UIxMailEditor.wox

@@ -168,6 +168,7 @@
 
         <!-- MESSAGE CONTENT -->
         <textarea name="content" var:class="editorClass"
+                  ck-locale="editor.localeCode"
                   ng-model="editor.message.editable.text"/>
 
         <!-- TOOLBAR BUTTONS -->

UI/WebServerResources/js/Mailer/MessageEditorController.js

@@ -104,6 +104,7 @@
     Preferences.ready().then(function() {
       if (Preferences.defaults.SOGoMailAutoSave)
         vm.autosave = $timeout(vm.autosaveDrafts, Preferences.defaults.SOGoMailAutoSave*1000*60);
+      vm.localeCode = Preferences.defaults.LocaleCode;
     });
   }