diff --git a/controllers/Index.php b/controllers/Index.php
index 2db0764881..2d9d7a348e 100644
--- a/controllers/Index.php
+++ b/controllers/Index.php
@@ -147,7 +147,7 @@ public function login() {
 
         $this->view->jsonSuccess([
             'success' => false,
-            'error' => 'invalid username/password'
+            'error' => \F3::get('lang_login_invalid_credentials'),
         ]);
     }
 
diff --git a/public/lang/cs.ini b/public/lang/cs.ini
index e3cc9764ad..70e201b90a 100644
--- a/public/lang/cs.ini
+++ b/public/lang/cs.ini
@@ -46,5 +46,6 @@ lang_more=více
 lang_login=přihlásit
 lang_login_username=jméno
 lang_login_password=heslo
+lang_login_invalid_credentials=špatné jméno nebo heslo
 lang_no_title=Bez titulku
 lang_error=nastala chyba
diff --git a/public/lang/en.ini b/public/lang/en.ini
index 86e4e18709..e973196a08 100644
--- a/public/lang/en.ini
+++ b/public/lang/en.ini
@@ -49,6 +49,7 @@ lang_more=more
 lang_login=login
 lang_login_username=username
 lang_login_password=password
+lang_login_invalid_credentials=invalid username/password
 lang_no_title=no title
 lang_error=an error occured
 lang_streamerror=No items loaded, reload?