Author: Tim Hunt
MDL-37599 question import: add missing string.
AMOS BEGIN
MOV [matcherror,question],[invalidgrade,question]
AMOS END
http://git.moodle.org/gw?p=moodle.git;a=commit;h=9970d909a3affb38e763316fb5608953ada76091
http://github.com/moodle/moodle/commit/9970d909a3affb38e763316fb5608953ada76091
+ 2.4 en [invalidgrade,core_question]
- 2.4 en [matcherror,core_question]