def connection_link_breadcrumb(action)
    referential_breadcrumb
    add_breadcrumb Chouette::ConnectionLink.model_name.human(:count => 2), referential_connection_links_path(@referential) unless action == :index
    add_breadcrumb breadcrumb_label(@connection_link), referential_connection_link_path(@referential, @connection_link),:title => breadcrumb_tooltip(@connection_link) if action == :edit