if you want to translate some modules, you have to make a ressource file. In this file, you can put the value of the global variables that you can find in the .html (as module.html) or .tpl files or all html lines created dynamicly in the java code.
For every modules, you have a "Resource_en_US.properties" file in the folder "org\jboss\nukes\core\modules\MODULE_NAME\languages" of the nukes lib.
You can copy it to create a Resource_Chinese.properties file and translate the value of the variables in chinese.
But I don't know how to choose the default langage file. If i find howto, i'll post again.