Fixed PHP warning when no IDN filters are set for field in lists.

Till Brehm

2015-11-14 cc636e1a8ed430f060766e22cbdfeaa8de4afbc3

 interface/web/admin/lib/lang/cz_users_list.lng

@@ -8,4 +8,3 @@
$wb['groups_txt'] = 'Skupiny';
?>