Author: David Mudrák
MDL-36266 Improve update notification message subject
http://git.moodle.org/gw?p=moodle.git;a=commit;h=2399585f7fceeab4ac0976f4719ae5dda4097bd9
http://github.com/moodle/moodle/commit/2399585f7fceeab4ac0976f4719ae5dda4097bd9
+ 2.4 en [updatenotificationsubject,core_admin]