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=fb5819b13c9aa493c4c8342813391b7a1e27c6d4
http://github.com/moodle/moodle/commit/fb5819b13c9aa493c4c8342813391b7a1e27c6d4
+ 2.3 en [invalidgrade,core_question]
- 2.3 en [matcherror,core_question]