I agree on the translation part. Llama 3.1 8B even at 4bit does a great job translating JP to EN as far as I can tell, and is often better than dedicated translation models like Argos in my experience.
I had a underwhelming experience with Llama translation, incompatable to Claude or GPT3.5+ which are very good. Kind of like Google translate but worse. I was using them through Perplexity.