Author: Eloy Lafuente (stronk7)
MDL-27171 take rid of 2 wrong strings moved to forum/lang/xx/forum.php
http://git.moodle.org/gw?p=moodle.git;a=commit;h=a31a6ce32d0ef8a231989ed79fcc9d9cabc5a6be
http://github.com/moodle/moodle/commit/a31a6ce32d0ef8a231989ed79fcc9d9cabc5a6be