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My solution is to find the file named "script.rpy", and change its suffix to '.txt'. Then you may open it and search the dialogues mentioned in the game, and just replace the dialogues with words in your language.  If there are garbled words when you start the game again, you just need to try another font which supports your language.

Thanks! The problem is solved!

Could I try translating this into Chinese so that fans of Umineko in China can also  play it?  Well...But I don't know which file is used to store dialogues. Is it the file named "script.rpy"？ But it doesn't seems to contain all the dialogues……