How do I change "Billing Address" and "Shipping Address" to "Primary Address" and "Secondary Address"?

I renamed the fields under the field modules, and also on the layouts so that “Billing” is Primary and “Shipping” is Secondary as we don’t ship products so it is weird as written. However the layouts still say Billing and Shipping. Do I have to edit a php file manually somewhere to rename it and is it okay to do so?

im sure a quick repair and rebuild would fix that up