How to change the name of the "subject" field in the ticket forms?

We have an interesting situation that is causing us some grief. We support students and educators. When they fill out our support ticket forms, they see a field that says "subject". To most users, this would seem to be the subject of their issue report. But for our users, a huge number of them think it's the subject they are studying or teaching in school. 

This means that we receive an inordinate number of tickets with the subject "math" or "english" and nothing useful that we can work with in our various reporting and tracking needs.

I realize that the "subject" field is a system field that cannot be altered via the Zendesk admin interface. However, I know that in the past I have seen creative solutions posted here that take advantage of code to make alterations to many parts of the interface. 

However, all my searches are coming up empty on this one.

Bottom line: I am looking for a way to change the field title "subject" to something else, such as "topic of your request".

Any help would be appreciated!