refactoring: use admin.register decorator
refactoring: use admin.register decorator

geometalab/osmaxx-frontend,geometalab/drf-utm-zone-info,geometalab/osmaxx,geometalab/osmaxx-frontend,geometalab/osmaxx-frontend,geometalab/osmaxx-frontend,geometalab/osmaxx,geometalab/osmaxx,geometalab/drf-utm-zone-info,geometalab/osmaxx