Fixes #91 (closed)
- Exhibitions are ordered historically
- The artworks in the campusart are sorted by the last re-date date
- When there is no favorite there is a text in the favorites dialog
- the death and birth year of the artists are displayed correctly formatted
- the paddings between the texts in the detail screen are only shown when there are texts.
- The selected language is safed and reloaded with the next start of the app.
- On the main screens (the screens with the tabbar) the user is informed when he loses his internet connection and when he reconnects
- You can now scan the new QR codes with the new identifiers