I've given code to NopCommerce team. They will approve or disapprove my contribution. If they like it, I may publish (or they have my permission to do so.).
We are also considering nopCommerce as our main e-commerce solution for business customers, as it is definitely the best open-source .NET app of its kind out there.
We are currently being retained by the fact that product/category localization is not delivered with the core application package.
We got a basic language extension to work, but it will break for sure whenever upgrading to newer versions. This detail makes nopCommerce currently unsuitable for real-world and long-term projects.