fix(directive): change event for listening to $translateChangeEnd

Under some circumstances, the cloak was not be removed:
* the translations are already stored (not via custom loader)
* no customer loader defined anyway

This changes the listening event to the change-end phase, which will be
invoked always.

Fixes #658

src/directive/translate-cloak.js

@@ -19,7 +19,7 @@ angular.module('pascalprecht.translate')
 
   return {
     compile: function (tElement) {
-      $rootScope.$on('$translateLoadingSuccess', function () {
+      $rootScope.$on('$translateChangeEnd', function () {
         tElement.removeClass($translate.cloakClassName());
       });
       tElement.addClass($translate.cloakClassName());