Following the example of Arch_Wall:
- Fixed object name.
- Default label is translatable.
- Name argument should only be used for the label and not be translated.
Removes unused imports as reported by LGTM.
There are exceptions: `import Arch_rc` is shown as an alert, but has side effects. It's not clear what the best thing to do in those cases is, so I've left them for now.
