Seeing as the full version has yet to be released, I'm confident that you can rewrite his dialogue so that the only prominent African character is not also the only one that speaks like a very bad online translator. Seriously. People calling him Q is fine. Having him be quiet because he's not confident in his mastery of the language is fine. Having some grammar errors is also fine. WHAT YOU WROTE IS FRANKLY RACIST.
If you don't want to do the work, I will HAPPILY rewrite it for you. And for free! Just please God either cut the racism or let me do it.