Show different strings when PO/DO user approves a cert

1. This is confusing for restricted users who don't have any options other
than 'Trust'.
2. show dialog title of "Check certificate" instead of "Trust or remove certificate"

The change only applies to ProfileOwner and DeviceOwner case

Fix: 28875819
Change-Id: I3f7dc8f3dcac75b4d99814cbc9af67433676a8c7