Author: Amaia Anabitarte
MDL-84805 badges: Titles must be unique
http://git.moodle.org/gw?p=moodle.git;a=commit;h=dc8e94eef8e1c07d7a22bb2aa98ceb44aa503acf
http://github.com/moodle/moodle/commit/dc8e94eef8e1c07d7a22bb2aa98ceb44aa503acf
+ 4.5 en [addcriterion,core_badges]