Allow backend and frontend locale to be set independently
Fix syntax error in inventory units controller
Make API correctly dependent on ActionController::Metal + Spree::Api::ControllerSetup

Fixes failing zones_controller_spec
base_controller_spec shouldn't attempt to grab a template
Dash depends on backend
[dash] Add authorization_helpers to spec_helper
Allow backend and frontend locale to be set independently
Dash depends on backend AND frontend
Move error_messages partial to core so that both backend+frontend can use it