> As a hongkonger (zh_hk + en_gb), living in Singapore (zh_cn + en?), following JPOP. This is the daily fight I have with browser.

Ah yes as a Korean living in Japan with locale set to English, this truly is a daily fight.

> I would rather all application, including web app just give me the option to choose

I've left websites for other competitors because they wouldn't have a button to change language.