Author: Andrew Nicols
MDL-68409 js: Add Alert modal
http://git.moodle.org/gw?p=moodle.git;a=commit;h=b810c84f2bf36255143bd4e49ada6f4d02a60e3a
http://github.com/moodle/moodle/commit/b810c84f2bf36255143bd4e49ada6f4d02a60e3a
+ 3.9 en [okay,core]