Author: Mathew May
MDL-68661 core_lang: Roll back addresourceoractivity
http://git.moodle.org/gw?p=moodle.git;a=commit;h=7f86455237d4ecac291462c9b9b63b4aeda30342
http://github.com/moodle/moodle/commit/7f86455237d4ecac291462c9b9b63b4aeda30342
+ 3.9 en [addresourceoractivity,core]