code: public static URL getResourceBundleURL(String resourcePath, ServletContext servletContext) {
  		URL resourceUrl = null;
  		try {
  			resourceUrl = ClassLoaderResourceUtils.getResourceURL(resourcePath, LocaleUtils.class);
  		} catch (Exception e) {
  			// Nothing to do
  		}
  
  		if (resourceUrl == null && servletContext != null && resourcePath.startsWith("grails-app/")) {
  			try {
  				resourceUrl = servletContext.getResource("/WEB-INF/" + resourcePath);
  			} catch (MalformedURLException e) {
  				// Nothing to do
  			}
  		}
  		return resourceUrl;
  	}
docs: Returns the resource bundle URL
  
  @param resourcePath
  the resource path
  @param servletContext
  the servlet context
  @return the URL of the resource bundle