How can I overwrite a Divi module? This is one of the most asked questions. The answer is fairly simple, and only requires 10 minutes of your life, but I can assure you that in the end, you will be happy that you spend those 10 minute.
The long answer: Starting with Divi 2.4, the Elegant Themes, brings a new way of working with your theme. Basically they introduce new features, which you only see in premium plugins like visual composer but the problem with those kind of plugins, is that sometimes they look much better in back-end then in front-end.
How to modify the Divi contact form module, to show the wordpress post, page, project title as the email subject, instead of the old way.