Untested as usual, in includes/functions.php find:
PHP Code:
$touser['languageid'] = iif($touser['languageid'] == 0, $vboptions['languageid'], $touser['languageid']);
Add after:
PHP Code:
$temptext = $pagetext;
$pagetext = preg_replace('/{bbusername}/i', $touser['username'], $pagetext);
Find:
PHP Code:
vbmail($touser['email'], $subject, $message);
Add after:
PHP Code:
$pagetext = $temptext;