Author: Kevin Percy
MDL-80746 core_course: Move initials selector from core_grades
http://git.moodle.org/gw?p=moodle.git;a=commit;h=939e6b546ae56d95b897c0e8fa165793da7bf353
http://github.com/moodle/moodle/commit/939e6b546ae56d95b897c0e8fa165793da7bf353
+ 4.5 en [filterbothactive,core_course]
+ 4.5 en [filterbyname,core_course]
+ 4.5 en [filterfirstactive,core_course]
+ 4.5 en [filterlastactive,core_course]