Author: Andrew Davis
MDL-45282 core_user: fixed up some oddities in the bulk user messaging screen
http://git.moodle.org/gw?p=moodle.git;a=commit;h=e7f899e32a974115cececf9a00e5db5d528cb18f
http://github.com/moodle/moodle/commit/e7f899e32a974115cececf9a00e5db5d528cb18f
+ 2.5 en [sitemessage,core]