Thanks Paul and Charles. When I created this Word document, I made sure all words that are not part of the flow of the sentence are italic. For instance, car in English is coche in Spanish. But both car and coche are italic; there's no difference in their style. (A sample page is at http://yong321.freeshell.org/lsw/sample1.html. Headwords are in bold. They are all Spanish for sure.)

I think I'll just use English proofing and visually check as much as I can. Thanks again.