maintaining naming convention

Add contact email address to event model
Show email link in footer
Fix missing event reference in AKDetailView

Introduce existing owner select field and dispatching views for POST submitted owner id
Adapt redirection flows
Adapt submission overview template
Introduce Owner edit view
Fix prepopulation issue in AKWish creation view (caused by inheritance)
Adapt template name to role as create and update template
Fix context issue for AK creation view (missing owner attribute)

currently only works when creating a new owner

create template for AK wish submission
create form for AK wish submission
create view for AK wish submission
adapt urls and buttons

Add template and template tag for messages
Adapt success url of AK creation to point to detail page of created AK and show success message

create form class
create template
configur urls
create submission view