private static String getI18nFile(String pluginName) {
        return pluginName.replace('.', '_') + "_i18n";
    }
Retrieve the <code>ResourceBundle</code> that is used with this plugin.

@param pluginName the name of the plugin.
@return the ResourceBundle used with this plugin.
@throws Exception thrown if an exception occurs.
xmppserver/src/main/java/org/jivesoftware/util/LocaleUtils.java