ok in talkpage/syntax.php at line 53, i replaced with :
if(substr($INFO['id'], -strlen($talkns)) === "$talkns") {
// we're on the talk page
$goto = substr($INFO['id'], 0, -(strlen($talkns) + 1));
$text = 'back';
} else {
// we want to the talk page
$goto = $INFO['id'] . ':' . $talkns;
if(page_exists($goto)) {
$text = 'talk';
} else {
$text = 'add';
$attr['rel'] = 'nofollow';
}
}
i think it's correct.