## Description
Fixed issue where setting a recipient role as CC will prevent any
further changes as it is considered as "sent" and "signed".
## Other changes
- Prevent editing document after completed
- Removed CC and Viewers from the field recipient list since they will
never be filled
- Minor UI issues
## Checklist
- [X] I have tested these changes locally and they work as expected.
- [X] I have added/updated tests that prove the effectiveness of these
changes.
- [X] I have followed the project's coding style guidelines.
