add access control to backend

common/models/User.php

@@ -209,7 +209,9 @@ class User extends ActiveRecord implements IdentityInterface
     
     public function attributeLabels(){
     	return [
-    			
+    		'username' => Yii::t('backend/user', 'Username'),
+    		'email' => Yii::t('backend/user', 'E-Mail'),
+    		'created_at' => Yii::t('backend/user', 'Created at'),
     	];
     }