Author: Jun Pataleta
MDL-67663 mod_forum: Add missing lang strings
http://git.moodle.org/gw?p=moodle.git;a=commit;h=0d3a580e03c0b1edb08462031a8706614b3ce15f
http://github.com/moodle/moodle/commit/0d3a580e03c0b1edb08462031a8706614b3ce15f
+ 3.9 en [actionsforgraderinterface,mod_forum]
+ 3.9 en [closegrader,mod_forum]