No translation, no navigation, no menu when going to account, checkout or custom pages

[tmechsner]

What I'm trying to achieve

When going to the account page, to checkout or cart or to custom pages that we added, the translation is broken and the navigation as well. It's the same in your demo shop at demo.saleor.io.

Steps to reproduce the problem

1. Set language to something else than english
2. Visit account or checkout

What I expected to happen

Translation should always be on and navigation should always show!
I think the issue is that getInitialProps in the custom app does not get called with certain paths, but I don't understand why.. This method loads the translated messages and navigation contents.

System information
Operating system: Ubuntu, OS X
Browser: Any