replace-item-items-text-for-foooter-cart.php

<?php
/**
* Replace your item and items text 
* for Footer Cart
*/

add_filter('ngettext_woo-product-table', 'wpt_custom_item_text_change', 10, 5);

function wpt_custom_item_text_change($translation, $single, $plural, $number, $domain) {
    if ($single !== '%d item') return $translation;

    switch ($translation) {
        case '%d item':
            return '%d iTEM'; // Replace with custom text, ensuring '%d' is present.
        case '%d items':
            return '%d iTEMSS'; // Replace with custom text, ensuring '%d' is present.
        default:
            return $translation;
    }
}