Update admin.php

replacing text with new added key values from language files (;errors - Invalid_Error)

system/admin/admin.php

@@ -44,7 +44,7 @@ function session($user, $pass)
 {
     $user_file = 'config/users/' . $user . '.ini';
     if (!file_exists($user_file)) {
-        return $str = '<div class="error-message"><ul><li class="alert alert-danger">ERROR: Invalid username or password.</li></li></div>';
+        return $str = '<div class="error-message"><ul><li class="alert alert-danger">' . i18n('Invalid_Error') . '</li></li></div>';
     }
 
     $user_enc = user('encryption', $user);