email notification for non english users

@Developers:

Please, dear developers, apply a patch for this community installation that german (and lots of other) users may have readable email-notifications:

please change line 233 in /mod/messages/start.php
//$message_contents = strip_tags($body);
$message_contents = html_entity_decode(strip_tags($body), ENT_NOQUOTES, 'UTF-8');