Author: Willian Mano
MDL-62485 enrol: Success message after enroll/unenroll user in a course
http://git.moodle.org/gw?p=moodle.git;a=commit;h=7a27c90102f8714f90d606c75f5182648befc36c
http://github.com/moodle/moodle/commit/7a27c90102f8714f90d606c75f5182648befc36c
+ 3.8 en [totalunenrolledusers,core_enrol]
+ 3.8 en [youenrolledincourse,core_enrol]
+ 3.8 en [youunenrolledfromcourse,core_enrol]