Bugfix/datagrid add row

  - added dom-ids for correct saving of new added rows 
  - added new rows to validation - still not working error probably in husky validation


- [x] finish the code
- [ ] gather feedback for my changes
- [ ] submit changes to the documentation


| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| Tests pass?   | none
| Fixed tickets | none
| Doc           | none