Author: Simey Lameze
MDL-42501 course: add help icon on delete gradebook options
http://git.moodle.org/gw?p=moodle.git;a=commit;h=a54229b6292376ade2fa0a1cd4b88e0498cddd59
http://github.com/moodle/moodle/commit/a54229b6292376ade2fa0a1cd4b88e0498cddd59
+ 2.8 en [removeallcoursegrades_help,core_grades]
+ 2.8 en [removeallcourseitems_help,core_grades]