Author: Sara Arjona
MDL-65127 message: add aria-labels to the numbers in the overview
Add aria-label to the unread message and notification icons.
Add aria-label to the total conversations, unread conversations
and unread messages in the overview.
Add aria-label to the pending contact requests in the overview
and also in the contacts tab.
Add aria-hidden to the last message date.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=26e2d21925e15ef2c52cec0e3480ebfec6b77627
http://github.com/moodle/moodle/commit/26e2d21925e15ef2c52cec0e3480ebfec6b77627
+ 3.6 en [pendingcontactrequests,core_message]
+ 3.6 en [totalconversations,core_message]
+ 3.6 en [unreadconversations,core_message]
+ 3.6 en [unreadmessages,core_message]
+ 3.6 en [unreadnotifications,core_message]