jQuery localization can handle this, but you need to layer your detection right. I built something similar last year and learned that browser language detection is pretty unreliable - users often have mixed preferences or browsers set to languages they don’t actually want. For manual overrides, store the user’s choice in localStorage or a cookie. Make sure it overrides automatic detection. When someone picks Portuguese, it should stick for their entire session no matter what their browser says. Set up your hierarchy like this: manual selection > stored preference > geolocation > browser language fallback. Watch out though - jQuery plugins can hurt SEO since search engines might not index translated content properly. If you can, handle the main language detection server-side and just use jQuery for manual switching. You’ll get way better search visibility for both languages that way.