use relative link for languages

[milahu]

cherrypick from 2fd53c0

[alex-shpak]

Hello!
Does this change fix some problem?

[milahu]

1 year later...

i guess this makes it work with github pages
where / is not the main path

[leoheitmannruiz]

What I've seen a few times is people serving their site at both www.example.org and example.org (not redirecting one to the other).

Then, if the link is absolute (for example www.example.org/page) and you're on example.org (no www), you're suddenly on www.exampe.org.

I suppose that is an example for why relative links are good practice?

I might be missing the benefits of absolute urls though :)