Author: Ryan Wyllie
MDL-55801 message: responsive styling for message app
http://git.moodle.org/gw?p=moodle.git;a=commit;h=99c7f0a731c1b10a5f3d3ec72956f6ffdf0d395b
http://github.com/moodle/moodle/commit/99c7f0a731c1b10a5f3d3ec72956f6ffdf0d395b
+ 3.2 en [deleteselectedmessages,core_message]
+ 3.2 en [selectmessagestodelete,core_message]
- 3.2 en [deletemessagesandconvos,core_message]