When using chat in other languages some printings call userdate() without fixing locale

example of location : mod/chat/report.php §169

adding the marked line fixes the issue and make userdate print in the correct locale.

        else {
            $sessionstart = $lasttime;
            if ($sessionend - $sessionstart > 60 and count($sessionusers) >= 1) {

>>>> setLocale(LC_TIME, substr(current_language(), 0, 2)); <<<<<
                echo '<p align="center">'.userdate($sessionstart).' --> '. userdate($sessionend).'</p>';

                print_simple_box_start('center');