To use different languages in CentraSite you create message bundle file for each different languages that you wish to render. Message bundles in CentraSite are located inside the <CentraSiteInstallDir>/cast/cswebapps/BusinessUI/custom/resources directory and are simple Java properties files.

Each bundle starts with the name i18nresources by convention and ends with the language (_en). By default, CentraSite looks in the i18nresources_xx.properties file for messages based on the user specific language.