As a Polish speaker I communicate with Claude using my native language and it does the same things. Most annoying and slowing down things are:

- acronyms and shortcuts - it makes it's own and start using it without introduction

- exotic names of variables or functions - it uses them as examples or analogies, but when I ask what they mean and where are they from it gives me answer that it came from C language or some C library (I only work with typescript and python)

- convoluted descriptions of code behaviour - it's hard to rely on a outcome of prompt of type "explain code in..."

It sounds like you need to invert the abstraction, the communication of your model becomes the fulcrum for your learning, not merely the delivery of your product.