ResourceBundle objects provided Sling i18n differ from the JRE implementations in that the key is returned as the message when no message exists. In other words, the key is the default message. This means that separate English messages do not need to be provided - they are the key.
You obviously can use Sling i18n with EN resource bundles, but it isn't done that way in AEM/CQ. See http://bit.ly/13ffzSt for documentation on how to change the languages available in that grid.
make sense Justin..I am able to proceed now.