Our company has worldwide customers, and we’d like to use discourse to set up a Q&A forum, does the frontend support multiple national languages? such as English, Chinese, etc.
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Discourse Language Support
The discussion revolves around whether Discourse supports multiple national languages. eynzhanga inquired about this feature for their Q&A forum with worldwide customers. ondrej confirmed that Discourse supports multiple languages and explained how users can change their language by enabling the “allow user locale” site setting and accessing their preferences → Interface.
pfaffman provided a direct link to the language selection page. eynzhanga appreciated the feature but suggested making it more easily discoverable, especially for non-English users, to facilitate a smoother user experience.
Yes it supports a host of other languages. When you get your Discourse change this site setting: allow user locale this way, when the user goes to their preferences → Interface they can change the language.
See this post to explain how to get there as a normal user:
See Discourse Meta - The Official Support Forum for Discourse in the interface section to select your language.
Thanks, that’s good news for me. the i18n is a key feature I need 
However this settings is not easy to discover when I first use Discourse, I suggest this can be put in outer layer so that it would be friendly for non-English users.
Imagin that a non-English user first visit this site, and user would like to switch language quickly, however he/she need so many steps to change, that would be painful.