fix: typo in zh-cn.json causes build error #2903

[Yogesh070]

Description

Fixed typo in zh-cn.json causing error in frontend build

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• DO make sure you are requesting to pull a topic/feature/bugfix branch (right side). Don't request your master!
• DO make sure you are making a pull request against the master branch (left side). Also you should start your branch off our master.
• DO make sure that File Browser can be successfully built. See builds and development.
• DO make sure that related issues are opened in other repositories. I.e., the frontend, caddy plugins or the web page need to be updated accordingly.
• AVOID breaking the continuous integration build.