Author: Paul Holden
MDL-81191 course: define batch stealth feedback language string.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=b2bc5b2849457a3df479c7a501036de2d7db6106
http://github.com/moodle/moodle/commit/b2bc5b2849457a3df479c7a501036de2d7db6106
+ 4.2 en [cm_stealth_feedback_batch,core_courseformat]