@media (max-width: 767px) {
    
    #rwd-table tbody tr td:nth-of-type(4):before {
        content: "Цена:";
    }
    #rwd-table tbody tr td:nth-of-type(5):before {
        content: "Кол-во:";
        text-align: left;
    }
    #rwd-table tbody tr td:nth-of-type(6):before {
        content: "Сумма:";
    }

}