• Update
  We received another tip mentioning this also works with Polish. We gave it a try and were able to replicate it on a Lenovo device. Assistant-enabled smart displays may unofficially

Back in November, Assistant added support for Brazilian Portuguese, and intelligent speakers were able to communicate with their owners in this language. Unfortunately, smart displays weren't so great at learning a new tongue and couldn't interact with people in Portuguese as quickly as Google Homes. However, the devices have now graduated and are fully fluent in the language, as Nest Hubs and similar devices can now handle conversations em português.