Author: Anthony Borrow
NOMDL: typo, removing duplicate prevent
http://git.moodle.org/gw?p=moodle.git;a=commit;h=ec05e10c12cb6889b67f4dbabbac7a4ef210bddc
http://github.com/moodle/moodle/commit/ec05e10c12cb6889b67f4dbabbac7a4ef210bddc
+ 2.0 en [requirepassword_desc,enrol_self]