PW WooCommerce Gift Cards Pro 1.470

- Fixed the Expiration Date format used on the PDF gift card and the preview. It now correctly uses the date format specified in the WordPress admin area under Settings > General > Date Format.

- Increased the hook priority to 1 for the send_headers hook that is used to display the PDF gift card. The priority can be changed by setting PWGC_SEND_HEADERS_PRIORITY in wp-config.php

- Fixed an issue with viewing a PDF with certain special characters in the message.