Author: Simey Lameze
MDL-42501 course: add help icon on delete gradebook options
http://git.moodle.org/gw?p=moodle.git;a=commit;h=7ae332a5b2f681dc25486a2309fa0f040386c2e2
http://github.com/moodle/moodle/commit/7ae332a5b2f681dc25486a2309fa0f040386c2e2
+ 2.7 en [removeallcoursegrades_help,core_grades]
+ 2.7 en [removeallcourseitems_help,core_grades]