[DE] Disable button for selecting language when the languages are not loaded.

apps/common/main/lib/controller/ReviewChanges.js

@@ -532,6 +532,7 @@ define([
 
         setLanguages: function (array) {
             this.langs = array;
+            this.view.btnDocLang.setDisabled(this.langs.length<1);
         },
 
         onDocLanguage: function() {

apps/common/main/lib/view/ReviewChanges.js

@@ -541,7 +541,8 @@ define([
                 this.btnDocLang = new Common.UI.Button({
                     cls: 'btn-toolbar x-huge icon-top',
                     iconCls: 'btn-ic-doclang',
-                    caption: this.txtDocLang
+                    caption: this.txtDocLang,
+                    disabled: true
                 });
 
                 Common.NotificationCenter.on('app:ready', this.onAppReady.bind(this));