You're talking about Spanish, right? Usually in Spanish, they put the adjective after the noun. Also, "bala" is a feminine noun, so it'd be "la bala negra."
But as long as you tell people it's a translation, I think you're okay. Without that information, yeah, it does sound a little... not PC.
As for actually answering the question, my first reaction would be to tell you that unless you have reason to believe something is broken or not working properly, you shouldn't mess with it. Second, I'd say that if you really want a learning experience for your class, then sure, why not? You'll learn, I'm sure.
I'm also not an expert on any of this, so it's highly possible that someone will offer contradictory advice. If they do, I suggest listening to them and disregarding my answer.