Composer updated (php composer.phar self-update).
ITT namespace registered in Application\Module. How is it possible, that it was working without it? And why did it stop working today?.. Magic...
The Query route is deprecated since in ZF2 v2.1.4. So, now the query option is used for the search-courses route (the pagination links)  instead.
Needless wrapping labels removed from the FormRow view helper.