Customize the "Our Contact Information" section in email footer

Currently the required contact information section of the email is completely un-editable. This means we are locked into design and copy constraints for all our outgoing emails.

Content wise, it would be nice to include more of our locations, as well as customize the wording to be more friendly to donors about how they can manage their communication preferences.

Design wise, this constrains the email designs we do to require light colored background and particular fonts. It would be nice to be able to incorporate this information in a more natural fashion into our branding.