After you accept a trade, the text that shows up is pretty lame and unprofessional. "Nice doing business with you, sucker!", I think is what it says. Personally, when I first saw this, I thought the person that I traded with has ripped me off.
My first reaction was whether I should kill him or not. So to make it even less confusing, the text needs to be more professional. This is rated M (or soon will be), I think we should handle things like an adult.