Fixed locale command.

build/controllers/LocaleController.php

@@ -7,8 +7,8 @@
 
 namespace app\controllers;
 
+use yii\console\Exception;
 use yii\console\Controller;
-use yii\helpers\FileHelper;
 
 /**
  * http://www.unicode.org/cldr/charts/supplemental/language_plural_rules.html