Notification of string changes

Author: ferran
MDL-83871 course: activity overview page
The old activities block will be fully replaced by a new course
activities overview page in the course secondary navigation. This
commit has the initial implementation of the page.


http://git.moodle.org/gw?p=moodle.git;a=commit;h=f6698b7567e51b9f863b51a02073674090dc8a4e
http://github.com/moodle/moodle/commit/f6698b7567e51b9f863b51a02073674090dc8a4e

+ 5.0 en [goto_overview,core_course]
+ 5.0 en [overview_info,core_course]
+ 5.0 en [overview_missing_notice,core_course]
+ 5.0 en [overview_missing_title,core_course]
+ 5.0 en [overview_page_title,core_course]
+ 5.0 en [course:viewoverview,core_role]