Alexa already can translate words and short phrases from and into a variety of languages, but Yahoo's sources say that Amazon is pushing for a true multilingual assistant that can perform more complex translations. Such a system would need to be aware of cultural as well as linguistic details, as well, as most language is dependent on contextual and situational cues. Yahoo's sources also note that eventually, Alexa will be able to translate conversations with multiple people speaking different languages at once, perhaps as an outgrowth of it's recognition systems for multiple users now. Obviously, this is all future-focused; you won't be able to use Alexa to go to that wedding in Japan just yet.