added terms of payment content and removed direct relation to terms of d...

__Tasks:__
- [x] added terms of payment content to entity
- [x] replaced select for terms by editable-data-row
- [x] removed direct relation to terms of delivery from entity, since not needed anymore

__Informations:__

| Q             | A
| ------------- | ---
| Tests pass?   | -
| Fixed tickets | -
| BC Breaks     | -
| Doc           | -