Quick fix error message showing

See merge request !208

GREG-154: Add gender field

See merge request !205

Modify register step form for guests

See merge request !204

- Passport Country now displays two letter code after
   selection.
- A heading has been added for identity information.
- An error message is now displayed if the user inputs both national id
   and passport information.

Resolves: GREG-120

GREG-138: Adding error message if ous or role types cannot be loaded

See merge request !201

GREG-127: Removing comment field, adding toggle for contact person field

See merge request !203

GREG-139: Feedback for guest registration error

See merge request !202

Add missing __str__ methods to the models

See merge request !194

Improve invitation link handling

See merge request !200

Make register page match sketches

See merge request !198

Page now also handles failing api requests when searching.

Resolves: GREG-134

Modify styling of sponsor frontpage

See merge request !196

Change rules for role dates

See merge request !189

Improvements to consent choices

See merge request !199

Allow sponsors access to all roles on their units

See merge request !185

It has been decided that a sponsor at a unit should have access to all
roles at that unit. This includes all units accessible through
hierarchical access.

Resolves: GREG-150