Yes, Here is the answer if you are using woodstock 4.0 and netbeans 5.5.
You must set the locales you want to support in both 
faces_config.xml
  <application>
    <locale-config>
       <supported-locale>en</supported-locale>
       <supported-locale>de</supported-locale>
     </locale-config>
  </application>
and web.xml
  <context-param>
    <param-name>com.sun.webui.theme.SUPPORTED_LOCALES</param-name>
    <param-value>en,de</param-value>
  </context-param>
With this, when you set your language to german or english in your browser,
the web app shows either localized version
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