The New Address Block and Edit Address Block windows
in Mail Merge wizard use the same ui file as the Custom
Salutation windows, yet they differ slightly in appearance
and a bit more in functionality.
There is already a help page for this, so we need a few HIDs
to be able to hook into that.

Change-Id: I5d1e11d62e28c02d74e0e6833e493923a5d699cf
Reviewed-on: https://gerrit.libreoffice.org/38327Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Katarina Behrens <Katarina.Behrens@cib.de>