Warning text for unregistering after deadline is unclear

Job Doesburg
2019-08-13T14:18:34+02:00

### One-sentence description

The warning text for unregistering after deadline is unclear

### Current behaviour / Reproducing the bug

The current text suggests that the fine for unregistering is fixed (it says "the costs per person of € x,xx").

### Expected behaviour

The text should suggest that the exact amount will be determined later, and that the amount that is indicated is just an estimate. The terms and conditions are clear about this, but it would be nice to make the initial warning text just as clear.