BridgeDB doesn't actually support non-english languages
The system/browser is set to Chinese, and when open bridge site: https://bridges.torproject.org/options, the page is not acutally in English or Chinese, or I should say it is in both English and Chinese. Here is what it looks like:
什么是网桥中继？ Bridges are Tor relays that help you circumvent censorship.需要使用其他获取方式获取网桥！ Another way to get bridges is to send an email to email@example.com. Please note that you must send the email using an address from one of the following email providers: Gmail or Yahoo.
The resource file (BridgeDB - bridgedb.pot) on Transifex is 100% translated.