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app/Http/Controllers/Controller.php

@@ -87,7 +87,8 @@ class Controller extends BaseController
 
     protected function __construct()
     {
-        App::setLocale(isset($_REQUEST['lang']) && $_REQUEST['lang'] == 'en' ? 'en' : 'zh-CN');
+        $lang = isset($_REQUEST['lang'])?$_REQUEST['lang']:'en';
+        App::setLocale($lang);
     }
 
     protected function success($data = [], $msg = '')