related fdo#62879 replace "section" in dialog for read-only content
because the dialog is not specific for sections

Change-Id: I22da8c6121a42acf5b25039770e0603a34193c36
Reviewed-on: https://gerrit.libreoffice.org/13348
Reviewed-by: Wesley J. Landaker <wjl@icecavern.net>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>