def ancestor_slugs
      return [] if !Config.get(:url_nesting) || parent.nil? || parent.root?
      visible_ancestors.map(&:slug).compact
    end
def ancestor_slugs
      return [] if !Config.get(:url_nesting) || parent.nil? || parent.root?
      visible_ancestors.map(&:slug).compact
    end
Slugs of all visible/non-language_root ancestors.
 Returns [], if there is no parent, the parent is
 the root page itself, or url_nesting is off.