(After downloading the confluence3.4.5-Chinese patch, there are two patches in it, choose one of them and upload it to the server $install_confluence/confluence/WEB-INF/lib, overwrite it and then enter the management page, set the language to Chinese Simplified and you're done
This document includes the following attachments:
confluence-zh_CN-plugin.jar
languages-zh_CN.jar
confluence3.4.5-Chinese....)