middle name is missing from the checkout address html templates

[AntonEvers]

Preconditions

1. create an account with a middle name in the name

Steps to reproduce

1. start an order, using an account with a middle name
2. visit the shipping address step in the checkout

Expected result

1. shipping address name should show [prefix, firstname, middlename, lastname, suffix]

Actual result

1. shipping address name shows [prefix, firstname, lastname, suffix]

Pull request is under way.

[AntonEvers]

This is already fixed in develop