Translated broken links might be saved by linking to en-US instead

[peterbe]

I think we should do the same with regular <a href> links too. E.g.

<p>Kolla in denna länken här <a href="/sv-SE/docs/Web/CSS">CSS</a>.</p>

should automatically become:

<p>Kolla in denna länken här <a 
  title="Page only currently available in English"
  href="/en-US/docs/Web/CSS">CSS (en-US)</a>.</p>

But that can be done as a separate thing.

Originally posted by @peterbe in #3053 (comment)

[peterbe]

This is blocked by #3133

[schalkneethling]

Looking at https://developer.mozilla.org/de/docs/Web/CSS/Reference and #3133 it looks like we got this covered.