First "version".

ToDo:

- [x] Basic Layout
- [x] Basic Google login (Only per session, no database records)
- [x] Basic I18n (Locale is chosen using Accept-Language and can be changed)
- [ ] Highlight actual page in menu
- [ ] Complete login functionality
- [ ] Write the language lines for the menu (That’s easy but so boring…)
- [ ] Use the preferred language from the user’s Google profile (requires completion of the login functionality)
- [ ] Reimplement [the old tools](http://yt.j.pfweb.eu/) in this new application
- [ ] Fill README with contents