added for attributes for labels

Added for attributes for labels, reviewed database queries, form submit on enter ...

- [x] test coverage
- [x] finish the code
- [ ] gather feedback for my changes
- [ ] submit changes to the documentation


| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| Tests pass?   | yes
| Fixed tickets | none
| Doc           | none