code: private static URL findHelpSetUrl() {
  		return LocaleUtils.findResource(
  				HELP_SET_FILE_NAME,
  				HELP_SET_FILE_EXTENSION,
  				Constant.getLocale(),
  				r -> ExtensionFactory.getAddOnLoader().getResource(r));
  	}
docs: Finds and returns the {@code URL} to the {@code HelpSet} that matches the currently set {@code Locale}.
  <p>
  The name of the {@code HelpSet} searched is {@value #HELP_SET_FILE_NAME}.
  
  @return the {@code URL} to the {@code HelpSet}, {@code null} if not found
  @see Constant#getLocale()
  @see HelpSet