Fix some design glitches across website:
* translated order statuses in backend
* polished cart summary in frontend
* fixed glitches at product page in frontend
Merge pull request #459 from stloyd/bugfix/design

Fix some design glitches across website
Be consistent and use `sylius_price` instead of `sylius_money`
Add ability to change payment status
Fixed wrong interface used in payment method model
Fixed rendering of percent field in backend
Created `state_label` macro for easier state rendering in backend