Author: Charles Fulton
MDL-46247 auth: Add new language for unauthorised external user
http://git.moodle.org/gw?p=moodle.git;a=commit;h=65d7932ca3f268445f2f0c6eab457189d3af4478
http://github.com/moodle/moodle/commit/65d7932ca3f268445f2f0c6eab457189d3af4478
+ 2.8 en [unauthorisedlogin,core]