Author: Andrew Davis
completion MDL-24119 new string that was previously in the code
http://git.moodle.org/gw?p=moodle.git;a=commit;h=7cd7627c8783b897999b01a994f18d36ac942431
http://github.com/moodle/moodle/commit/7cd7627c8783b897999b01a994f18d36ac942431
+ 2.0 en [completiononunenrolment,core_completion]