Author: John Okely
MDL-39913 assign: Add help on filetype submissions
http://git.moodle.org/gw?p=moodle.git;a=commit;h=d00a536a0c1782a2fa60b61b26f7cb811fab1581
http://github.com/moodle/moodle/commit/d00a536a0c1782a2fa60b61b26f7cb811fab1581
+ 3.2 en [acceptedfiletypes_help,assignsubmission_file]