Changing the language of a permalink should redirect to the same permalink in that language
Steps to reproduce:
Visit a permalink page on the support portal, say https://support.torproject.org/id/faq/faq-2/. Then change the language from the menu on the top right to a different language, Catalan in this example.
The support portal redirects to the main page for Catalan.
The support portal should redirect to the same question and not to the main page. So in this case, it should redirect to https://support.torproject.org/ca/faq/faq-2/ and not https://support.torproject.org/ca/.