Feature: #465 - Updated backend views

See Issue 465

Description

The view of the backend module were refactored. This has the following benefits:

  • No inline CSS which avoid problems with Content-Security-Policies.
  • Clearer design.
  • Responsive design (old design was not usable on smartphones).
  • Order tables with colors to improve the visibility of status of orders.
  • Backend CSS reduced / updated to really used HTML.

Impact

Own overwrites might need adaption otherwise this change should not have any negative impact.