Very cool! I've transitioned from using Google Translate and DeepL to ChatGPT for translations. In general I think the ChatGPT translations are better, but the default UI for is a little tedious. Looks like your tool solves this problem.

I tried translating some Japanese, but the result is not correct.

兄や弟さえも憎むようになりました.

I have come to hate even my brothers and sisters.

It should be "I have come to hate even my older brother and younger brother."

Are you using ChatGPT 3.5? I've found that you need to use version 4 to get quality translations as 3.5 makes a lot of mistakes.