Struts 2 仍有多語言的支援，相關的文件可以查看 http://struts.apache.org/release/2.2.x/docs/localization.html ，搜尋的順序是：
ActionClass.properties
Interface.properties (every interface and sub-interface)
BaseClass.properties (all the way to Object.properties)
ModelDriven's model (if implements ModelDriven), for the model object repeat from 1
package.properties (of the directory where class is located and every parent directory all the way to the root directory)
search up the i18n message key hierarchy itself
global resource properties
