convert all help responses to gtk's -11

and ok responses to gtk's -5
and cancel responses to gtk's -6
and close responses to gtk's -7
and yes responses to gtk's -8
and no responses to gtk's -9

Change-Id: Ia1a261a3a711ed9f5d8c0b0c639897c3064bb08c
Reviewed-on: https://gerrit.libreoffice.org/50206
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>