Closes: - https://github.com/vercel/feedback/issues/51569 - https://github.com/vercel/feedback/issues/51578
Internal suggestion to remove `en-US` from Mozilla urls since MDN is available in multiple languages nowadays it will automatically redirect to the viewer’s language preference. Closes [DX-2076](https://linear.app/vercel/issue/DX-2076/make-external-mozilla-links-language-agnostic-in-nextjs-docs)
This PR is part of a larger effort to migrate error messages to MDX and use App Router: https://github.com/vercel/front/pull/23459