Author: Jun Pataleta
MDL-86998 message: Fix accessibility issues in notification settings
* Fix missing labels for the checkboxes that enable notification plugins
* Add an accessible name for the Default notification preferences table
* Fix missing table header for the preference column of the Default
notification preferences table.
* Accessibility Behat test coverage for the Notification settings
admin page
* Remove the unnecessary title attributes for the visually hidden labels
http://git.moodle.org/gw?p=moodle.git;a=commit;h=bc607ceb0b4796428191147e46046a9b4aea57c8
http://github.com/moodle/moodle/commit/bc607ceb0b4796428191147e46046a9b4aea57c8
+ 4.5 en [enablenotificationplugin,core_message]