diff --git a/application/core/LSYii_Application.php b/application/core/LSYii_Application.php
index 5de2f788d70..b7d81781f4a 100644
--- a/application/core/LSYii_Application.php
+++ b/application/core/LSYii_Application.php
@@ -213,6 +213,13 @@ public function getConfig($name, $default = false)
     */
     public function setLanguage( $sLanguage )
     {
+        // This method is also called from AdminController and LSUser
+        // But if a param is defined, it should always have the priority
+        // eg: index.php/admin/authentication/sa/login/&lang=de
+        if ($this->request->getParam('lang') !== null){
+            $sLanguage = $this->request->getParam('lang');
+        }
+
         $sLanguage=preg_replace('/[^a-z0-9-]/i', '', $sLanguage);
         $this->messages->catalog = $sLanguage;
         App()->session['_lang'] = $sLanguage;                                   // See: http://www.yiiframework.com/wiki/26/setting-and-maintaining-the-language-in-application-i18n/