Ampersand in username breaks Central Auth link

[Cabayi]

Appeal 58915 for Jiboner&to links to
https://meta.wikimedia.org/wiki/Special:CentralAuth?target=Jiboner&to
which delivers Central Auth for Jiboner

[Salvidrim]

Sounds like the & character needs to be encoded as %26 before being output as an URL, to give the right result:

https://meta.wikimedia.org/wiki/Special:CentralAuth?target=Jiboner%26to