How to translate the game?

How it translates the game?

(excuse me but I don’t speak English very well)

Try https://translate.google.com/

Or ask online do they speak your language. People play PMU from around the world so they might speak your language.

Through the source code I can’t translate the game?

I’m not entirely sure what exactly you need to edit the change all the logs and game text. I’ll ask Andy if he knows.
On a related note, I do know that you can replace the buttons in the Graphic User interface by making a customized skin.
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I know the game didn’t have convertable languages in mind when starting this engine, so it might be a bit of work . :/

Most messages are generated on the server side, so you can’t do that directly.