Author: David Mudrák
MDL-36266 Improve update notification message subject
http://git.moodle.org/gw?p=moodle.git;a=commit;h=77283f1812f125b31caff9cf4713f4fb6be8fa66
http://github.com/moodle/moodle/commit/77283f1812f125b31caff9cf4713f4fb6be8fa66
+ 2.3 en [updatenotificationsubject,core_admin]