Corrected translation for "Clock" tab's strings in the Time preference app.

Signed-off-by: Matt Madia <mattmadia@gmail.com>
Note: Judging by the logs, this should have been part of hrev45037.
Corrected system name translation for Playground app.

Signed-off-by: Matt Madia <mattmadia@gmail.com>
Added icons with better perspective, from jstressman.

From #8747