Author: Jun Pataleta
MDL-35971 mod_forum: Add proper discussion list table description
http://git.moodle.org/gw?p=moodle.git;a=commit;h=6783597dc06de3777790db2cd35f74482c5c3ea9
http://github.com/moodle/moodle/commit/6783597dc06de3777790db2cd35f74482c5c3ea9
+ 3.7 en [showingcountoftotaldiscussions,mod_forum]