Author: Kenneth Hendricks
MDL-29795 assign: Add missing inactiveoverridehelp lang string
http://git.moodle.org/gw?p=moodle.git;a=commit;h=f73c5b519c508392a741777a5590516ea5e59df3
http://github.com/moodle/moodle/commit/f73c5b519c508392a741777a5590516ea5e59df3
+ 3.2 en [inactiveoverridehelp,mod_assign]