Author: Mark Nelson
MDL-29801 core_message: added ability to delete messages
Thanks goes to Jetha for providing the HTML and CSS.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=36d29c089ce83a5a10b9e581a5e6c63f1ba15f17
http://github.com/moodle/moodle/commit/36d29c089ce83a5a10b9e581a5e6c63f1ba15f17
+ 3.0 en [deletemessage,core_message]
+ 3.0 en [deletemessageconfirmation,core_message]