You should provide a seperately property file for other locale such as chinese locale:
en resource file: Resource.properties
chinese resource file: Recource_zh_CN.properties
In chinese resource file, you should include all key same as in english file and its' chinese value.
Then, in you program, you need give property file's base name and user's prefer locale to initial ResourceBundle:
ResourceBundle bundle = ResourceBundle.getBundle(Resource, client_locale)