* Tweak - Use a related order's currency rather than the store default currency for vouchers, whenever possible
* Fix - When a voucher has a limit on characters set in the optional message to recipient, count Unicode (e.g. accented) characters correctly
* Fix - When the My Account page is set as the home page make sure that the Vouchers page is accessible
* Fix - Allow adding notes to a voucher that is being created manually in admin before it is saved for the first time or the PDF has been generated
* Fix - Save notes added when redeeming vouchers via the modal popup in the Vouchers admin edit screen
* Fix - Harden some method calls when getting the currency from an order, in case it's not an order object of the expected type
* Fix - Replace the textdomain of some gettext strings with the correct one for this plugin
* Fix - Pass a default value of null in `woocommerce_loop_add_to_cart_link` filter callback so that no errors would be triggered in some instances when no value is passed
