Author: Peter
MDL-65032 mod_forum: Add discussion locking functionality
http://git.moodle.org/gw?p=moodle.git;a=commit;h=2893812eb019e459d94f68b63a78d94a8ebb1321
http://github.com/moodle/moodle/commit/2893812eb019e459d94f68b63a78d94a8ebb1321
+ 3.7 en [clicktolockdiscussion,mod_forum]
+ 3.7 en [clicktounlockdiscussion,mod_forum]
+ 3.7 en [locked,mod_forum]
+ 3.7 en [notlocked,mod_forum]