Place all icons in the footer bar

To focus the user's attention to the one-call-to-action-per-page functions, we should get all secondary functions out of the way and place them with big Icons in the footer:

• Home (Landings Page)

2. Info
3. Import
4. Language Switcher
5. Theme Switcher
6. Sound
7. QR Code
8. Reset

Of course, only those icons should be shown which make sense in the given context (workflow sensitive).

There should be nothing in the header except for the quiz name or the ARSnova-Logo when on the landing page.