"Closing in..." not translatable in this version

The current code in "better_messages.js" is very unhandy for translations:
$('.message-timer').text(Drupal.t('Closing in' + ' ' + seconds + ' ' + Drupal.t('seconds')));

I think it's much better if the line would look like this:
$('.message-timer').text(Drupal.t('Closing in @seconds seconds', { '@seconds': seconds }));