* Change coupons sum to distinct coupon count in REST API
* Hook up unique coupon count to orders summary numbers
* Add coupons count to order segmenting
* Add coupons count to expected stats in order test and revenue tests
* Translation call text domain change from “wc-admin” to “woocommerce-admin”.
* Fix .pot file generation.
* Fix errantly closed array item in /revenue/stats controller.
* Rename plugin zip, main file, and repo name to "woocommerce-admin".