A filter to change text using gettext filter. This one changes the WooCommerce/Storefront mini cart.

get-text.php

<?php

/**
* Change the “No products in the cart” message when hovering over the mini-cart
*
*/

function lar_text_strings( $translated_text, $text, $domain ) {
    switch ( $translated_text ) {
      case ‘No products in the cart.’ :
      $translated_text = __( ‘new text here’, ‘woocommerce’ );
      break;
      }
    return $translated_text;
    }
add_filter( ‘gettext’, ‘lar_text_strings’, 20, 3 );