Author: Dongsheng Cai
"MDL-23308, bring course files back"
http://git.moodle.org/gw?p=moodle.git;a=commit;h=e921afa874a07bc33e6cb37a65560f2c4f4f07a3
http://github.com/moodle/moodle/commit/e921afa874a07bc33e6cb37a65560f2c4f4f07a3
+ 2.0 en [coursefilesedit,core]
+ 2.0 en [coursefileswarning,core]