[Feature Request] Redirect invalid language code to default page

[BraINstinct0]

For example, there is no page as https://justgetmydata.com/kr/. This might not seem like a problem, but going from JustDeleteMe site to JustGetMyData site preserves the language code, thus landing one at the 'presumably translated page'-which doesn't exist.

[daviddavo]

I think this can be fixed at the same time as #18 is fixed, but it would require to change a bit how the page works in the "backend" (Jekyll)