update name of label in Hyperlink dialog

Change-Id: I715fccf17272c7f905945eb5357da1854c5c9811
Reviewed-on: https://gerrit.libreoffice.org/11655
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>