Glad you asked! We are actually the only project (open source or closed), as far as I know, that handles multilingual quite well. We have options to do multilingual query-expansion and also multilingual embedding models.

Without dropping any names, a big french company with 5000 people is actually doing this with Danswer and have found great success.

There is some info here: https://docs.danswer.dev/configuration_guide You'll also want to change the embedding model in the admin UI