Updated copyright line in base email template
Updated copyright line in base email template

- Replaced hard-coded year so we no longer need to update this (or translations) annually
- Corrected punctuation

edx/ecommerce,mferenca/HMS-ecommerce,edx/ecommerce,edx/ecommerce,eduNEXT/edunext-ecommerce,mferenca/HMS-ecommerce,eduNEXT/edunext-ecommerce,edx/ecommerce,mferenca/HMS-ecommerce,eduNEXT/edunext-ecommerce,eduNEXT/edunext-ecommerce