Merge pull request #544 from nsendetzky/master

Improves layout of delivery/payment list and tax rate, fixes costs per item in lists
Merge pull request #545 from nsendetzky/master

Uses media and content view helpers to simplify and streamline templates
Merge pull request #546 from nsendetzky/master

Removes duplicate language and currency definitions
Merge pull request #547 from nsendetzky/master

Implements creating demo data on request