PW WooCommerce Gift Cards Pro 3.1

- Added translation for Norwegian Bokmål. Created a new hook to allow overriding the temporary directory for the PDF gift cards: pwgc_mpdf_temp_dir

- Added a new hook to be able to override the Check Balance page on the My Account area: pwgc_balance_page

- Added a new hook to allow changing the email item data: pwgc_customer_email_item_data. Improved the accuracy of the Outstanding Balance amount in the admin area by rounding at each step. Fixed a conflict with PPOM for WooCommerce when changing the shipping method on the Cart or Checkout pages.