i18n Default Language Policy

Anonymous visitors resolve language in this order:

1. ?lang= query param
2. Saved language selector choice (localStorage in the browser, mirrored to the i18nextLng cookie for SSR)
3. Browser/device language when it is one of our supported locales
4. Fall back to en

Country or region is not used to override a supported browser/device language. For example, de-DE resolves to German, nl-NL resolves to Dutch, and pt-PT resolves to Portuguese because those locale families are supported.

If no browser/device language matches a supported locale, visitors receive the English default.