Author: Jamie Pratt
MDL-47494 ddmarker: NOBUG implemented highlighting of incorrectly dragged drag items.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=70c434ee5b82f77dbf5e740c081d4517757b02f8
http://github.com/moodle/moodle/commit/70c434ee5b82f77dbf5e740c081d4517757b02f8
+ 3.0 en [followingarewrong,qtype_ddmarker]
+ 3.0 en [followingarewrongandhighlighted,qtype_ddmarker]