Add PEP 545 redirect for Swedish translation

[StanFromIreland]

Description

Requesting @JulienPalard

[StanFromIreland]

Thanks!

[hugovk]

Should there also be a redirect for https://docs.python.org/sv/ -> https://docs.python.org/sv/3/ instead of showing the nginx directory index?

Compare https://docs.python.org/fr -> https://docs.python.org/fr/3/

[StanFromIreland]

That's what this PR adds :-), I assume it has not made it to prod yet though.

[JacobCoffee]

it should have, i updated the internal side immediately after merging and it was at the 14 minute mark (salt runs every 15 minutes)

[StanFromIreland]

It seems the same thing happened the last time this was done (#598 (comment)), we may need to wait for something else to rebuild?

[hugovk]

It was the Fastly cache, I purged it with curl -X PURGE https://docs.python.org/sv/ and https://docs.python.org/sv/ is now redirecting.

Thanks!

[StanFromIreland]

Thanks guys!