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Moving the root layout into the [locale] segment makes html lang server-rendered, deletes the client-side language bootstrap, and passes the structural audit.

TL;DR: We replaced a client-side script that guessed the reader's language with Next.js's recommended pattern: nesting the root layout under a dynamic locale segment so the lang attribute renders correctly on the server. This brought free 404s for unknown locales, static prerendering, and correct screen-reader pronunciation, even on 404 pages. Detection now lives in an Accept-Language redirect instead.

A tiny ArticleBody bug made paragraphs split and spacing drift. The fix was not a parser rewrite, just merging consecutive HTML fragments.