I love how there is a Catalan version too! I guess it’s probably a requirement for getting the .cat domain.
Does look to be the case.
nyan.cat has a language picker that includes Catalan, even though it just changes the page title.
The funny thing is that upon registration of a .cat domain you are required to acknowledge that your website is not related to cats at all. So those domains are, in theory, not in compliance.
https://icannwiki.org/.cat
> Administered by the non-profit Fundació puntCAT under the oversight of ICANN, registrations are available only to individuals and organizations demonstrating use or promotion of the Catalan language and culture.