Feature/action is for field

[annashamray]

task - https://taiga.maykinmedia.nl/project/open-inwoner/task/698
and action list improvements:

• show start_date before end_date and in the same format
• add defaults for empty values to avoid showing 'None'

[annashamray]

@alextreme I couldn't reproduce the empty dropdown, but anyway I changed the field.queryset for both cases - with and without a plan

Without a plan it should be a disabled dropdown

[JostCrow]

It works correct. The only small thing that I found is that when an input/select element is disabled, it does not change the cursor to not-allowed.

[annashamray]

I can do it but it will not be consistent with our disabled buttons style. In disabled buttons we display default cursor

[alextreme]

Okay, this is sufficient for now imho.