Author: Jamie Pratt
MDL-47494 ddmarker: NOBUG hopefully made some of the student facing messages more intelligible
http://git.moodle.org/gw?p=moodle.git;a=commit;h=67a2afa43e3f07eb8818a3fc7ed70d9bf54b4524
http://github.com/moodle/moodle/commit/67a2afa43e3f07eb8818a3fc7ed70d9bf54b4524
+ 3.0 en [followingarewrong,qtype_ddmarker]
+ 3.0 en [followingarewrongandhighlighted,qtype_ddmarker]
+ 3.0 en [pleasedragatleastonemarker,qtype_ddmarker]