“At launch, the feature will work with six language pairs — English and Spanish, French, German, Italian, Brazilian Portuguese, or Hindi — on Echo devices with [the default language] or locale set to English US,” says the official blog post.
How to Use Alexa’s Live Translation Feature
After the beep, whatever you say in your language will be translated into the language your partner speaks and vice-versa. While Alexa will speak out translated sentences on Echo speakers, you will be able to read the conversation on Echo Show smart displays. Once you’re through with the conversation, just say “Alexa, stop” to end the Live Translation session. It’s that easy but there’s one shortcoming. The feature currently seems to work only with Echo speakers and smart displays. I was unable to initiate a Live Translation on the Alexa app on my OnePlus Nord.