How to Change "Buy this Photo" to "Add to Cart"?

thehikingdude

Has anybody had success changing the text from Buy this Photo to Add to Cart? I realize this is fairly trivial on the surface, but I'm hoping to make the option look more like the web default.

I've seen another thread about this with a coding suggestion (which I couldn't find), but I and others have not been able to get it to work.

Any thoughts?

Thanks!