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1) Create a file named admin_zh_CN.properites in your packages/resources directory. This directory can be in a plugin or in your project depending for which you are providing translations.
This step is harder than it first appears because the underlying libraries FarCry uses are based on the i18n libraries for Java. Sadly, this means that the files must be encoded in iso-8859-1 which mean complex encodings like Chinese must use the Unicode translated equivalents.
For example, instead of typing things like "题目" in the file you need to type "\u9898\u76EE". Translating using Unicode escapes by hand is very tedious and time consuming. Luckly, since FarCry uses the resource bundle standards, however, tools are availiable to make translation much easier. Once such tool is the resource bundle editor for Eclipse: http://sourceforge.net/projects/eclipse-rbe/
2) Add the locale so it can be chosen. Edit the file farcryConstructor.cfm in your project, and add the locale to the THIS.locales variable. For example, this:
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