def stop_area_breadcrumb(action)
    referential_breadcrumb
    add_breadcrumb Chouette::StopArea.model_name.human(:count => 2), referential_stop_areas_path(@referential) unless action == :index
    add_breadcrumb breadcrumb_label(@stop_area), referential_stop_area_path(@referential, @stop_area),:title => breadcrumb_tooltip(@stop_area) if action == :edit