JSF has always had decent internationalization support. Since JSF 1.0 you can supply java.util.ResourceBundle-based bundle files in different locales, which in turn get dynamically included as text in the web page at the declared places. Also, all JSF converters and validators have their own set of localized default messages which you can easily customize via a message bundle or, since JSF 1.2, via new requiredMessage, converterMessage, and validatorMessage attributes. JSF 2.0 adds, via ...
14. Localization
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