Notification of string changes

Author: Mikel Martín
MDL-78280 core_courseformat: New completion dropdown UI
- Move completion information to a new output class 'core_courseformat\output\local\content\cm\completion'
- Replace current dropdown with 'core\output\local\dropdown\dialog'
- Modify manual conditions logic in course page. Now 'Mark as done' button will only be displayed to
tracked users (with moodle/course:isincompletionreports capability)
- Add new styles for completion dialog contents


http://git.moodle.org/gw?p=moodle.git;a=commit;h=e5908a1ce4485ecfd3bd6117a2cb1ef606526619
http://github.com/moodle/moodle/commit/e5908a1ce4485ecfd3bd6117a2cb1ef606526619

+ 4.3 en [studentsmust,core_completion]
+ 4.3 en [youmust,core_completion]