Author: Simey Lameze
MDL-42501 course: add help icon on delete gradebook options
http://git.moodle.org/gw?p=moodle.git;a=commit;h=bb6114d8b6d9d52820dbe1e93da0714efd39f563
http://github.com/moodle/moodle/commit/bb6114d8b6d9d52820dbe1e93da0714efd39f563
+ 2.9 en [removeallcoursegrades_help,core_grades]
+ 2.9 en [removeallcourseitems_help,core_grades]