Author: Petr Skoda
MDL-29824 improve notification of max number of enrolled users
http://git.moodle.org/gw?p=moodle.git;a=commit;h=78c5042e06cf5e6a414d07a34b2181b3745cad84
http://github.com/moodle/moodle/commit/78c5042e06cf5e6a414d07a34b2181b3745cad84
+ 2.2 en [nopassword,enrol_self]