Add TODOs for other data manipulation/auto-creation/...-tasks

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

avoid clashes with python keyword

Add dynamic title handling to base html
Add more information to submission overview
Move AK list to own file for use in other pages
Add detail view for AK
Add views with AK overview list as well as filtered lists (by type and tag)
Add corresponding German translations

Create mixin (FilterByEventSlugMixin) to handle even slug parsing in generic views
Add submission url config
Include submission urls in central url config
Add index view for submissions