Author: Andrew Davis
rating MDL-23908 made roles information even clearer
http://git.moodle.org/gw?p=moodle.git;a=commit;h=1704f647327cf02ccf8b1070843b9d920f8799de
http://github.com/moodle/moodle/commit/1704f647327cf02ccf8b1070843b9d920f8799de
+ 2.0 en [canrate,core_rating]
+ 2.0 en [rolewarning,core_rating]
+ 2.0 en [ratingtime,mod_forum]