Author: Jun Pataleta
MDL-70731 mod_forum: Fix moodle_exception error messages
http://git.moodle.org/gw?p=moodle.git;a=commit;h=2a606b6a1020176d969c0d769198cfa96f2301b3
http://github.com/moodle/moodle/commit/2a606b6a1020176d969c0d769198cfa96f2301b3
+ 3.11 en [errordiscussionnotfound,mod_forum]
+ 3.11 en [errorforumnotfound,mod_forum]