Author: Sara Arjona
MDL-64985 message: add aria label to cancel selection button
Add aria labels for cancel edit message button (the little cross
when selecting messages).
http://git.moodle.org/gw?p=moodle.git;a=commit;h=0f7c44657effcc2cc798481d302c407854d036ac
http://github.com/moodle/moodle/commit/0f7c44657effcc2cc798481d302c407854d036ac
+ 3.6 en [cancelselection,core_message]