The app would work for any language, but the definitions and exercises will be written in English. I created a list just now for German words and added the German word "Zeitreise". It generated this definition:

<<"Zeitreise" in a German mystery series means time travel. It refers to the act of a character or characters moving through time, either to the past or the future, often as a central element of the mystery's plot.>>

Exercises were asked in English.

"What does "Zeitreise" mean?":

- Time travel - Train journey - Long wait - Difficult puzzle

Maybe a feature where you can choose the language would be cool. I mean, someone might prefer to learn German using German, or say Spanish using Turkish.

Again, thank you for pointing it out. I will update the README and hopefully add inference language preference feature.