“Today, Amazon launched Alexa’s new Live Translation feature, which allows individuals speaking in two different languages to converse with each other, with Alexa acting as an interpreter and translating both sides of the conversation. With this new feature, a customer can ask Alexa to initiate a translation session for a pair of languages. Once the session has commenced, customers can speak phrases or sentences in either language. Alexa will automatically identify which language is being spoken and translate each side of the conversation. ”
Source : How Alexa’s new Live Translation for conversations works