WL-100 fixed the bug on the edit/add coupon and set course price.
Ajax requests were duplicating in each callback. fixed this issue by creating the manual ajax request rather than the Lean Modal Ajax requests
Merge pull request #5586 from edx/muhhshoaib/WL-100-coupon-codes-duplicating-upon-creation

WL-100 fixed the bug on the edit/add coupon and set course price.
allow for better White Label branding in shopping cart purchase emails

fix up typos and text

fix goof

fix

fix
Merge pull request #5580 from edx/cdodge/use-generic-signature-on-email

Cdodge/use generic signature on email
incorporated model changes as suggested by Jason.

updated order sales csv

updated test cases for CourseRegCodeItem model and csv for the order generated sales