Improving email templates.

Adding some {% trans %} tags needed by jinja.
Merge pull request #64 from mbehrle/fix/email_templates_jinja

Improving email templates.
Update nereid dependency to 3.0.8.1

Needed since 3.0.8.1 makes the `party.address.remove_address`
method available.
Added Header in address-add template #4622
Merge pull request #66 from goyal1092/feature/task-4622

Added Header in address-add template #4622
Use system supervisorctl (on demo shop)