Ignore print service settings activities if they are not exported.

1. The print spooler cannot start not exported activities and they
   should not be started from another application anyway. Therefore,
   we do not start them from settings too even though settings can
   do that since it is signed with the platform certificate.

2. Adding some string changes to meet the translation deadline.

bug:10680224

Change-Id: I69c189e1c502985aceb68d269492f2e86de44ec4