Author: jeromemoodle
MDL-26179 implement the new 5 registration use cases
http://git.moodle.org/gw?p=moodle.git;a=commit;h=c73f196391ee27728bdf4a3c8ff63f073ff6d1b2
http://github.com/moodle/moodle/commit/c73f196391ee27728bdf4a3c8ff63f073ff6d1b2
+ 2.0 en [previousregistrationdeleted,core_hub]
+ 2.0 en [renewregistration,core_hub]
+ 2.0 en [restartregistration,core_hub]
+ 2.0 en [siteemail_help,core_hub]