I've just been looking for where I change these values, and it doesn't seem possible.
They are not included on the theme's Widget Config page, which is where I'd expect them to be.
Unfortunately it is not possible to add them to the administration of the theme as these are resources in nopCommerce and they are managed separately.
You can read more about nopCommerce resources here
in our Glossary and watch this video
to see how to change them.