The question is broad in scope since we cannot certainly know if we have translated all documents, or if we have translated them Faithfully. That being said the most likely language of their translation would be English as it’s the de facto language of scholarship. A second language where the translation may be found is in German due to the efforts of max mueller et al.

For example Aryabhattiya - one of the most prominent treatment of mathematics can easily be found online. I only had to google the name of the book + English translation. It’s a Chicago university press translation. Same with brahmasphutsiddhanta - which comes next in the pantheon of mathematics works of India. In fact, it is a good bet that I as a non-gambling man would take; that if you know the name of the book, an English translation exists.

If your question is towards how much work has been done to find out what Indian mathematics had “figured out” before forgetting it and joining the mainstream, that’s a topic of research even today. A book on history of mathematics written a hundred years ago would have contained much less information about Indian contribution to mathematics - and did.