code: @Override
  	public String getDisplayValue(final ResourceBundleKey resourceBundleKey)
  	{
  		return ResourceModelFactory
  			.newResourceModel(getPropertiesKey(resourceBundleKey.getKey()),
  				resourceBundleKey.getParameters(), component, resourceBundleKey.getDefaultValue())
  			.getObject();
  	}
docs: Gets the display value.
  
  @param resourceBundleKey
  the {@link ResourceBundleKey} object
  @return the display value