Add some helper to get NatNum12 state
Modify both Number format dialog and Sidebar
Transform CAT_ defines in enum
Change-Id: Iaa3127bf07223caac60e409306a1bee2edc37428
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/145513
Tested-by: Jenkins
Reviewed-by: Eike Rathke <erack@redhat.com>