Author: Ilya Tregubov
MDL-77638 grade: Create add/edit grade category modal.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=1d3f4d631dca5aed5afe639c2f1c52684d79e199
http://github.com/moodle/moodle/commit/1d3f4d631dca5aed5afe639c2f1c52684d79e199
+ 4.3 en [calculationwarning,core_grades]