Author: Yuliya Bozhko
MDL-43978 badges: Fix lang string
http://git.moodle.org/gw?p=moodle.git;a=commit;h=3193b97e05b0de70e25700abd59ee445aa4c965b
http://github.com/moodle/moodle/commit/3193b97e05b0de70e25700abd59ee445aa4c965b
+ 2.7 en [error:guestuseraccess,core_badges]