[Change any string in WooCommerce] #woo

change-string.php

add_filter( 'gettext', 'maxpapi_translate_woocommerce_strings', 999, 3 );
function maxpapi_translate_woocommerce_strings( $translated, $untranslated, $domain ) {
   if ( ! is_admin() && 'woocommerce' === $domain ) {
      switch ( $translated ) {
         case 'Weight':
            $translated = 'Shipping Weight';
            break;
         case 'Dimensions':
            $translated = 'Shipping Dimensions';
            break;
      }
   }   
   return $translated;
}