DownloadProvider: CS translation

Change-Id: I9f7a3a8496447dc0047ec523e9fc57f9bc0c64d4
Remove download notification after preview

Removes download notification from the notification bar after
previewing it. There should be an additional check for download
shown in the notifications after completion to prevent from
situation when ContentObserver is unregistered and the onChange
is never called.

Change-Id: I0914a680f08eb96949b56e08719eb28d2e80ccc9