Author: Juan Leyva
MDL-65976 completion: New course completion message provider
http://git.moodle.org/gw?p=moodle.git;a=commit;h=417e5b9f84621a572a50510ae356cfdb75416ae5
http://github.com/moodle/moodle/commit/417e5b9f84621a572a50510ae356cfdb75416ae5
+ 4.0 en [coursecompletedmessage,core_completion]
+ 4.0 en [messageprovider:coursecompleted,core]