This remove the AKTags model and its usage in views, forms, templates, translations, and backup script
This implements #164

This consists of a bash script to call and prepare as well as a python script to process the dump created by django and restrict it to the entries related to the event

closes #58

Adapt settings
Add i18n urls to central url conf
Add language chooser to base.html
Adapt readme and utils

add Utils directory
add Utils README
add setup script
add check script
add update script
document usages in top-level README