Author: Sam Hemelryk
MDL-27161 Improved the 2 new strings in assignment
http://git.moodle.org/gw?p=moodle.git;a=commit;h=32af9814f10bd235721c024bc39cfcd365877eee
http://github.com/moodle/moodle/commit/32af9814f10bd235721c024bc39cfcd365877eee
+ 2.0 en [norequiregrading,mod_assignment]
+ 2.0 en [nosubmisson,mod_assignment]