Hence we need a separate string as header in the dialog. Unfortunately I
did not see this when applying 0cf38e7d

Change-Id: Ib60cef29e663e71a25849df1d5a926f0e871bb8b
(cherry picked from commit ffebdead)
Reviewed-on: https://gerrit.libreoffice.org/17239Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>
Tested-by: Markus Mohrhard <markus.mohrhard@googlemail.com>