Author: Shamim Rezaie
MDL-31355 mod_forum: Prevent users from posting after cut-off date
http://git.moodle.org/gw?p=moodle.git;a=commit;h=cbf63d8efc874a1b6d9e66fbfde1c4ceb6352f4f
http://github.com/moodle/moodle/commit/cbf63d8efc874a1b6d9e66fbfde1c4ceb6352f4f
+ 3.7 en [cutoffdatereached,mod_forum]
+ 3.7 en [forum:canoverridecutoff,mod_forum]
+ 3.7 en [thisforumhasduedate,mod_forum]