Merge pull request #136 from nsendetzky/master

Adds .pot/.po files to transifex and completes .po files
Merge pull request #137 from nsendetzky/master

Streamlines address format, optimizes text e-mail layout
Merge pull request #138 from nsendetzky/master

Uses HTML5 input types for address fields, makes company field mandatory if selected and updates translations
Merge pull request #139 from nsendetzky/master

Adds VAT to basket, checkout summary and confirmation e-mail
Merge pull request #140 from nsendetzky/master

Adds english translation files again (because transifex doesn't allow to create translations in the same language as the source language)