code: public static ResourceBundle getBaseResourceBundle(Class<?> aClass, String aBundleName) {
  
          ResourceBundle bundle = null;
          final Class<?> clazz = aClass;
          final String bundleName = aBundleName;
  
          // Need a special classloader trick to load the ENGLISH messages (from the base bundle).
          // See BaseResourceBundleClassLoader for more info.
          ClassLoader cl = AccessController.doPrivileged(
                          new PrivilegedAction<ClassLoader>() {
                              public ClassLoader run() {
                                  return new TraceNLSBundleClassLoader(clazz.getClassLoader(), bundleName);
                              }
                          });
  
          bundle = ResourceBundle.getBundle(bundleName, Locale.ENGLISH, cl);
          return bundle;
  
      }
docs: Return the Base (English) resource bundle since we do not explicitly ship the _en bundle.
  
  @param aClass
  the class utilizing the resource bundle
  
  @param aBundleName
  the name of the resource bundle
  
  @return ResourceBundle
  the base resource bundle