Author: Jun Pataleta
MDL-65948 core_grade: Use category names as master checkbox labels
Use the name of the grade categories as label to distinguish master
checkboxes from regular ones.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=e4e9e56882030f9c9c0a131bb27ce2516e28f3be
http://github.com/moodle/moodle/commit/e4e9e56882030f9c9c0a131bb27ce2516e28f3be
+ 3.9 en [textellipsis,core]