I don't understand Japanese, so I can't correct the errors. But it is possible to generate a reasonably good quality AI multilingual translation project and add it to the game, including fonts and settings for multiple languages. Each language consumes approximately $3 of API quota. Common languages such as English, German, French, Spanish, Chinese, Japanese, etc., can be generated and there is no limit to the number of translated languages that can be produced.
Generating translation files in Ren'Py is actually a very simple process. It's just that many authors didn't think about the fact that their work might be viewed by users who speak different languages. After all, their living environment is mostly English.