Author: David Mudrák
MDL-56486 workshop: Use the new filetypes element in the mod_form
The element copes well with the legacy syntax - just extensions, no
dots. So the upgrade step is not actually necessary here. The element
has in-built validation so there is no need to validate it explicitly
here again.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=f9a8d98047de524051b646fc3fd0ae238a8e3e49
http://github.com/moodle/moodle/commit/f9a8d98047de524051b646fc3fd0ae238a8e3e49
+ 3.4 en [allowedfiletypesforoverallfeedback_help,mod_workshop]
+ 3.4 en [allowedfiletypesforsubmission_help,mod_workshop]