Author: Sara Arjona
MDL-64985 message: add better aria labels to the actions menu
Add better aria labels to the action menus in messaging, renaming
some labels and declaring it as a menu.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=2e9a457330bda44f83c293c02c47145281c05450
http://github.com/moodle/moodle/commit/2e9a457330bda44f83c293c02c47145281c05450
+ 3.7 en [addtofavourites,core_message]
+ 3.7 en [conversationactions,core_message]
+ 3.7 en [info,core_message]
+ 3.7 en [removefromfavourites,core_message]