Incorrect translation of ‘shipping’ at woocommerce checkout page after WC update 3.4*

This seems to be a common bug likely caused by the WC update. To solve the issue the best solution currently seems to be use the filter “woocommerce_shipping_package_name”

function custom_shipping_package_name( $name ) {
  return 'Frakt';
}
add_filter( 'woocommerce_shipping_package_name', 'custom_shipping_package_name' );