Broken link checkers should fallback to en-US if possible #3254
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Fixes #3104
Take http://localhost:3000/bg/docs/Web for example.
Compare it with https://developer.mozilla.org/bg/docs/Web
There are lots of broken links on that page (in Prod). And a lot of them are really broken because when you click on one of them (e.g. https://developer.mozilla.org/bg/docs/Web/Apps) you get a 404 Page not found, but without that helpful "Good news!" (green) message that it's available in English. That's because that Belarusian link is so broken and old that it doesn't check for redirects.
Now it becomes this: