Make sure popper frontend dependency is always loaded before bootstrap script files load
This fixes #121 as well as issues in admin interface (scheduling and track management)
Make track management javascript more robust (this resolves an issue occurring when moving an AK with track back to list of AKs without tracks)

Ask user if they really want to change the language as it will clear the form as soon as the main form on the page was edited at least once.
Fixes #80

Add choosen-js library and assets for nicer looking multiple select
Add new blocks for loading of individual assets to base template
Use choosen-js for multiple fields in AK submission view

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

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 base.html
Add common template folder to settings