Author: Andrew Nicols
MDL-48309 mod_forum: Add discussion subscription to the navigation
http://git.moodle.org/gw?p=moodle.git;a=commit;h=5eddcfee3400aa7292aaa38743162cc8dd24ba7a
http://github.com/moodle/moodle/commit/5eddcfee3400aa7292aaa38743162cc8dd24ba7a
+ 2.9 en [confirmsubscribediscussion,mod_forum]
+ 2.9 en [confirmunsubscribediscussion,mod_forum]
+ 2.9 en [subscribediscussion,mod_forum]