Author: Charles Fulton
MDL-33139 forum: indicate which user's post was edited
http://git.moodle.org/gw?p=moodle.git;a=commit;h=c2c071a27446e0bdbf3ec56a4d71156841ef6b8b
http://github.com/moodle/moodle/commit/c2c071a27446e0bdbf3ec56a4d71156841ef6b8b
+ 2.3 en [editedpostupdated,mod_forum]