Good work. I've often found llm's to be "stupider" when speaking Norwegian than when speaking English, so it's not surprising to find they hallucinate more and can't stick to their instructions in other non-English languages.
there must be a ranking of languages by "safety"
What would be interesting then would be to find out what the composite function of translator + executor LLMs would look like. These behaviors makes me wonder, maybe modern transformer LLMs are actually ELMs, English Language Models. Because otherwise there'll be, like, dozens of functional 100% pure French trained LLMs, and there aren't.