It’s a very relevant question for those who are interested in an international wedding. Speaking of the language, some Latin girls know English, so, there shouldn’t be many problems. But still, a more widespread language in Latin America is Spanish. If your girlfriend knows only it, you will have to use some translation services. But from getting acquainted till the wedding there will be enough time to learn some Spanish for you and to learn at least the basics of English for her. Don’t be afraid of the language barrier because the language of love is international!