Fourth preview releae

Highlights of this preview are:

• Widgets (list widget and a "sticky note" widget)
• New dialog which warns you, if changes will be discarded, wenn you press the back button in a note detail
• Animations of notes in the overview are turned off, these were buggy and after some time annoying
• Translation to german

I hope you enjoy it, but be warned: there are still many bugs ;-)
@lhitc : Thank you for your tests!