Author: ferran
MDL-84469 core_course: add fallback activity overview
http://git.moodle.org/gw?p=moodle.git;a=commit;h=488244d12d6cd4b75d092246125246dbe414b110
http://github.com/moodle/moodle/commit/488244d12d6cd4b75d092246125246dbe414b110
+ 5.0 en [overview_missing_notice,core_course]
+ 5.0 en [overview_modname,core_course]
- 5.0 en [goto_overview,core_course]