Author: Paul Holden
MDL-81551 factor_webauthn: inform user on successful key registration.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=0d616b13e122079a0c2b5775705537433cefef4c
http://github.com/moodle/moodle/commit/0d616b13e122079a0c2b5775705537433cefef4c
+ 5.0 en [registersuccess,factor_webauthn]