Author: Jun Pataleta
MDL-67663 mod_forum: Add missing lang strings
http://git.moodle.org/gw?p=moodle.git;a=commit;h=c20f4f5efd98573469b6e3cb2df6f618b1dbfb27
http://github.com/moodle/moodle/commit/c20f4f5efd98573469b6e3cb2df6f618b1dbfb27
+ 3.8 en [actionsforgraderinterface,mod_forum]
+ 3.8 en [closegrader,mod_forum]