Update Polish translation
Italian translation: update

Sync'ed with 8943303fce6589c031b6918cda137a0d3980644a
Fix null pointer exception in settings activity on update
Merge branch 'Corly-master'
Merge branch 'zetok-translation'
Merge branch 'Ansa89-patch-1'
Register on typing change callback
Create a proper database upgrade method rather than dropping all tables.
Merge remote-tracking branch 'upstream/master'