Author: Ben Kelada
MDL-372 forum: Improve pinning and update for Moodle 3.0
http://git.moodle.org/gw?p=moodle.git;a=commit;h=5f219cf18109babdd2359050006be574b8423193
http://github.com/moodle/moodle/commit/5f219cf18109babdd2359050006be574b8423193
+ 3.1 en [discussionpinned,mod_forum]
+ 3.1 en [discussionpinned_help,mod_forum]