TYPO3 pages/pages_language_overlay erweitern - ext_localconf

/***
 * pages-Tabelle Erweitern
 */
// Elemente 'slide'-bar machen
$GLOBALS['TYPO3_CONF_VARS']['FE']['addRootLineFields'] .= ',tx_extendtest_background_image';

/***
 * pages_language_overlay-Tabelle Erweitern
 */
$TYPO3_CONF_VARS['FE']['pageOverlayFields'] .= ',tx_extendtest_background_image';