Updated translations for https://github.com/spree/spree/commit/d4ff64bf865dfddf900d04ec8b9acc163d1e6838

Clean up the admin product tab

Order confirmation email follows latest Spree conventions

Show filename instead of file extension on invoice
Use 2-2-stable in Gemfile
Validate attachment content type in accordance with Paperclip 4 security rules
Whitelist more types.
Fix spec.
Updated the location of the order_tabs override

The override broke with change at https://github.com/spree/spree/commit/22a70b62aa873ce23a584ad07e729f6e95a04baa#diff-2f549f834ee39b2abfde52d8901b984c

Also, changed the link_to method to an icon, which matches the other order tabs.
Set working version of sass-rails.
Only add a second link if the variant isn't the master
Merge branch 'create_digital_links' of https://github.com/davekiss/spree_digital into 2-2-stable
refactor for us
Merge branch 'master' into 2-2-stable

Conflicts:
	app/overrides/spree/shared/_order_details/add_digital_downloads_to_invoice.html.erb.deface
	app/views/spree/admin/digitals/_form.html.erb
	config/locales/en.yml
Merge pull request #1 from deseretbook/2-2-stable

update for us