Make registrations readonly on completed

Merged Sébastiaan Versteeg requested to merge fix/make-registrations-readonly-on-completed into master

Closes #690 (closed)

Previous behaviour

Steps to reproduce:

  1. Complete registration
  2. Editable form in backend

New behaviour

Steps to validate that it works:

  1. Complete registration
  2. Non-editable form in backend
Edited by Sébastiaan Versteeg

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