Intent-To-Package: GNU Hello (again, for snapcrafters)

The hello snap isn’t quite open for contribution, so I decided to implement one that does, and fix-up some issues found from it like lacking I18N support.

This snap is intended to be transferred to the snapcrafters organization in the near future and is thus using the name hello-snapcrafters. You may find the current source here:

Comments and PRs are always welcomed.