* Fix: When bulk generating, importing or sending store credit with an empty coupon expiry date, it is setting the date as 1970-01-01 which is invalidating all those coupons
* Fix: Not checking for an empty value for delivery date if 'Deliver coupon' is set to 'Later'
* Update: Filter 'wc_sc_deliver_coupon' to set default option for 'Deliver coupon' to 'Later' on the checkout page when the customer is opting to send the coupon to someone else
* Update: Set autoload for 'sc_wc_db_update_status' option as 'no'
* Update: Spelling correction from 'Certficate' to 'Certificate'
* Update: POT file
