Help Scout is a popular help desk software with a built-in a knowledge base solution called Docs. If you use Docs, you can now translate it with Transifex Live. Not only can you provide great email support, but you can offer answers to your users 24/7 in their native language too.
P.S. If you haven’t heard, we’ve also built a Transifex Live-based WordPress plugin for translating your WordPress site.