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とりあえずβ版サイトを2ページ翻訳しました。先に数ページ翻訳してから reactjs/react.dev#4135 で頼めばブランチプレビューを(手作業で)セットアップしてくれるそうです。
ローカル環境では
cd beta; yarn; yarn dev
で正しく表示されています。