Author: Tim Hunt
MDL-32721 quiz: missing message provider lang string from MDL-3030
http://git.moodle.org/gw?p=moodle.git;a=commit;h=9ab9f9feb7c071b627eb634b45bb3dcaab7995c9
http://github.com/moodle/moodle/commit/9ab9f9feb7c071b627eb634b45bb3dcaab7995c9
+ 2.3 en [messageprovider:attempt_overdue,mod_quiz]