ANSWER:

If you don’t say the duaa at all, your Umrah is valid. 

However, you should learn them in Arabic as they are only few words and sentences to be said at specific places. The rest of tawaf and sa’ae, you can make your own duaa in your native language

QUESTION: I’m a revert and cannot read Arabic. I plan to do umrah. Are the dua’s during tawaf and in sa’i compulsory? Can I read them in English ?