1) вот это оно?
<?if ($arParams['SHOW_MAX_QUANTITY'] == 'Y'):?><span id="quantity_box" <?=$arResult['CATALOG_QUANTITY'] == 0?'style="display: none;"':''?>><span id="quantity"><?=$arResult['CATALOG_QUANTITY']?></span><?endif;?>
2) вот это оно?
MESS_BTN_BUY: '<? echo ('' != $arParams['MESS_BTN_BUY'] ? CUtil::JSEscape($arParams['MESS_BTN_BUY']) : GetMessageJS('CT_BCE_CATALOG_BUY')); ?>',