i18n routing respects protocol

Previously, if a non-logged in user visited `https://www.reddit.com/i18n` they would be redirected to the *insecure* `http://www.reddit.com/r/i18n`

Site redirection should respect security settings.
This intentionally went to `www.reddit.com` so that opensource installs could contribute back to upstream i18n. I'm not sure if protocol relative URLs would work here, but you could just link to `https` only.