Author: Ryan Wyllie
MDL-55822 message: accessibility improvements for popovers
http://git.moodle.org/gw?p=moodle.git;a=commit;h=eeee7bca80c852ec6d3fb3d9077ad49240a09b90
http://github.com/moodle/moodle/commit/eeee7bca80c852ec6d3fb3d9077ad49240a09b90
+ 3.2 en [viewmessageswith,core_message]
+ 3.2 en [viewunreadmessageswith,core_message]