Convert PAGE_DBASE to .ui

Change-Id: Ie2f1592b030465a2ca5e2f25408ae38e9a833831
Reviewed-on: https://gerrit.libreoffice.org/10777
Reviewed-by: David Tardon <dtardon@redhat.com>
Tested-by: David Tardon <dtardon@redhat.com>