Changes for Spree 2-2-stable

Test does not pass due to a bug in spree_static_content
(https://github.com/spree/spree_static_content/pull/146)
Added spree 2.2 as dependency
Update spree_static_content branch in Gemfile.
i18n injected to code
Extended for default labels
Merge in i18n changes.
Merge branch '2-2-stable' of https://github.com/Willianvdv/spree_admin_bar

Conflicts:
	Gemfile