Translatable string

You can't translate the "max. number of messages" string if the mark up and the actual message is combined. It works again if the code on line 101 is changed to this:

>
$block['content'] = t('<p><div class="messages status"><em>') . t('You cannot send more than %number messages per hour. Please try again later.', array('%number' => variable_get('contact_hourly_threshold', 3))) . t('</em></div></p>');
<