Hi Meggs,
I am sure that non-native English speakers on this forum are the rule rather than the exception. As far as I know there is no official standard for a US bonafide translator. My wife is from South America and we have had documents translated from Spanish into English both here in San Francisco and in South America. In both cases the translator made a positive affirmation of their skill and training as a translator on the certificate of translation that they created for the document being translated. Just about any translator that you find in the Yellow Pages will do, so long as the translator is fluent in the original language of the document being translated. Spanish into English is pretty easy to accomplish here in California.
Scott