Author: Andrew Nicols
MDL-53566 core: Add UI for context locking
http://git.moodle.org/gw?p=moodle.git;a=commit;h=3a8cf5e67d98a203f72b43454f45405d0b4d1d42
http://github.com/moodle/moodle/commit/3a8cf5e67d98a203f72b43454f45405d0b4d1d42
+ 3.6 en [confirmcontextlock,core_admin]
+ 3.6 en [confirmcontextunlock,core_admin]
+ 3.6 en [contextlocking,core_admin]
+ 3.6 en [contextlocking_desc,core_admin]
+ 3.6 en [managecontextlock,core_admin]
+ 3.6 en [managecontextlocklocked,core_admin]
+ 3.6 en [managecontextlockunlocked,core_admin]
+ 3.6 en [managecontextunlock,core_admin]