fdo#39468 Translate German Comments - vcl/source/window/msgbox.cxx

Change-Id: Ia0874709c03bc912fc4bf3efecf7ff3e84bbc82b
Reviewed-on: https://gerrit.libreoffice.org/8428
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>