It could not speak because it has no mouth, but as far as the translation go, I'd say somewhere in between. AFAIU, there's been some indication that GPT-4 works with concepts (so e.g. if it gets extra training for a specific task in one language, its performance on that task improves in other languages as well), GPT-3.5 probably does too, to a lesser extent.
I'm not trying to be pedantic; these are two very different tasks.