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=e2d400a136677c0f79de1f336971d22c706b965d
http://github.com/moodle/moodle/commit/e2d400a136677c0f79de1f336971d22c706b965d
+ 3.6 en [addtofavourites,core_message]
+ 3.6 en [conversationactions,core_message]
+ 3.6 en [info,core_message]
+ 3.6 en [removefromfavourites,core_message]