Author: Andreas Grabs
MDL-27827 - Missing messageprovider:message language string
http://git.moodle.org/gw?p=moodle.git;a=commit;h=65ee5d7dad4b199912cbfde9acb915ae3a3f567a
http://github.com/moodle/moodle/commit/65ee5d7dad4b199912cbfde9acb915ae3a3f567a
+ 2.1 en [messageprovider:message,mod_feedback]