We had a very prominent footer showing how to get in contact with the
local instance people but most users need to get in contact with the
enterprise they are buying from. So removing all those details and
replacing them by a simple "powered by" line will hopefully direct
attention to the shop's contact details.
- Partial is used by both the invoice pdf and the order confirmation email
- separate scss file for new payment list table
- extracted outstanding balance logic (also changed in payments view.. admin/orders/RXXX/payments)
- translations in shared.payments_list and lazy loaded
This fixes the following deprecation warning
```
DEPRECATION WARNING: Extra .css in SCSS file is unnecessary. Rename /usr/src/app/app/assets/stylesheets/darkswarm/variables.css.scss to /usr/src/app/app/assets/stylesheets/darkswar
m/variables.scss. (called from _app_views_layouts_darkswarm_html_haml___3990351141569700945_46957256630860 at /usr/src/app/app/views/layouts/darkswarm.html.haml:18)
(...)
```
