This can work to your advantage. In my case, a developer in the EU made claims against an app of mine, and since all of the legal documents arrived in a foreign

This can work to your advantage. In my case, a developer in the EU made claims against an app of mine, and since all of the legal documents arrived in a foreign language, it cost twice as much to have a lawyer simply evaluate the claims -- they had to use a partner firm in the originating country to translate the documents. The ongoing cost of lawyers made me fold and remove the app from the store. I still maintain to this day that I did nothing wrong, there was zero infringement and his claim was 100% legally bogus, but I couldn't afford to keep the lawyers on top of it. So, what was bad for me might be good for you. Get a lawyer and have him draft something really strong in Spanish.