Translate.net Main_page does not show right translation for zh-tw users by default

Nice find. We rarely use translatewiki.net while not logged in and this issue (incorrect accept language mapping) deserves a solution.

It's not about being logged in. Using uselang=zh-tw on the main page shows the same effect.

Maybe Translatewiki.net does not detect the language of browsers or it passes wrong translations for zh-tw language?