I mean...my mom's Japanese, but I'm not fluent by any means...I've been practicing for a while, but it's really far-fetched that suddenly I can be speaking it to you.

[She rubs at her temples, aaagh this is hard.]

I think in this case we can just assume that this world has forced a universal language on all of us. I'm not sure how, but then again we're in this world without any of our special abilities and we have these intelligent animals working with us.