_getNotificationDataSingle( stream, icon ) {
		const settings = this.settings.content.notification.click;
		const name = get( stream, "user.display_name" );

		return new NotificationData({
			title: this.intl.t( "services.notification.dispatch.single", { name } ).toString(),
			message: stream.title || "",
			icon: icon || iconGroup,
			click: () => this._notificationClick( [ stream ], settings ),
			settings
		});
	}
Show a notification for each stream
@param {TwitchStream} stream
@param {string} icon
@returns {NotificationData}