Author: Marina Glancy
MDL-57187 label: allow to drag and drop video/audio files
http://git.moodle.org/gw?p=moodle.git;a=commit;h=59e004cd79f58acc49910f2940a0177dc1f5092a
http://github.com/moodle/moodle/commit/59e004cd79f58acc49910f2940a0177dc1f5092a
+ 3.3 en [dnduploadlabel,mod_label]