Author: Andrew Davis
rating MDL-24558 new string for when no ratings have been submitted
http://git.moodle.org/gw?p=moodle.git;a=commit;h=1d4a834c10eb9cf8e8acabd91382e7000eace7a6
http://github.com/moodle/moodle/commit/1d4a834c10eb9cf8e8acabd91382e7000eace7a6
+ 2.0 en [noratings,core_rating]