added missing language string already present in default theme

cfoe

2012-05-22 0ae667e6cfdd1bcc85bacf85cd93a84f99fa88f8

 interface/web/client/lib/lang/pl_clients_list.lng

@@ -6,4 +6,5 @@
$wb['city_txt'] = 'Miasto';
$wb['country_txt'] = 'Kraj';
$wb['add_new_record_txt'] = 'Dodaj nowego klienta';
$wb['username_txt'] = 'Login';
?>