When applying for any process through a Spanish consulate, it is important to follow all instructions closely. The consulates have a website with information on the various processes they offer.
Requirements for USCIS Translations
Any document in a foreign language that is to be submitted to the United States Citizen and Immigration Services (USCIS), must be translated to English. The USCIS is an agency of the United States Department of Homeland Security that is responsible for administering the country’s naturalization and immigration system.