I live in Montreal, Quebec, and according to the law all documents have to be done in French and if necessary in English, but the reality is that I end up making them in both languages; I guess that you are in USA and you do not have such a law, but if you want the people to follow your guidelines, you have to make them in the language that they will understand, so you are better off making them in both languages.
For experience I know that it is difficult, specially if you do not speak Spanish; try to use Google translator, but have it check for a Spanish speaking person since you can end up with a funny translation that nobody will understand, nevertheless that translation will be a start point for the person that will help you.
Good Luck
Doris