Render incoming typing notifications

We're not sending typing notification ourselves,
but at least now we can see them coming
from the good clients that do.
Internationalize incoming typing notification text
translate the typing notification to Polish
Merge pull request #1 from tsudoko/patch-1

Translate the typing notification to Polish
Merge pull request #419 from Ansa89/italian-translation

Italian translation: update
Merge branch 'incoming_typing_notifications' of https://github.com/albel727/uTox
Italian translation: update