Juni says it most of the time in Romanian - miau, spelled like German (I guess, she would enjoy a talk with Tigris and Filou if their German and Romanian sound the same).
But, as I said before, I am a translator and I speak with her in Romanian, Russian and English, some French from time to time and I like to call her Katze, like in German. OF COURSE, she understands everything, 'cause she answers back
She must know some Japanese too, but it's not from me. She's getting along very well with Pikachiu as you can see