Author: David Mudrak
Fixed the error string wording
http://git.moodle.org/gw?p=moodle.git;a=commit;h=432ef8036801a91903177bbe604bb0d0411fe150
http://github.com/moodle/moodle/commit/432ef8036801a91903177bbe604bb0d0411fe150
+ 2.0 en [cannotretrieveqcat,core_question]