Author: Ryan Wyllie
MDL-66893 mod_forum: update user picker in grader UI
http://git.moodle.org/gw?p=moodle.git;a=commit;h=def5f1493940f05caa5f0c316addbd53a0c5bd27
http://github.com/moodle/moodle/commit/def5f1493940f05caa5f0c316addbd53a0c5bd27
+ 3.8 en [nextuser,mod_forum]
+ 3.8 en [previoususer,mod_forum]
+ 3.8 en [usernavigation,mod_forum]