* Fix - "Abort Reason" blocks user to proceed to checkout eventhough another shipping method available.
* Fix - "Per Order" label is still used after the calculation type is changed to "Class" type.
* Tweak - WC 6.3 and WP 5.9 compatibility.
* Fix - Min & max with zero value is not equal with empty.
* Fix - Translations are not being loaded.
* Fix - Fatal error on PHP 8.0 by replacing "%" with "%%".
