I have been working with Dreamweaver since 2000 and have always used the application in Spanish. I've never had a problem for that reason taking some simple precautions like using the numbers from 1 to 9 or the letters of the English alphabet to name variables, form fields, or anything else that is going to be part of the code of a page.
I think I'm going to stay with the extensions: there is a project for which I will need them. Maybe I need more help. Thank you