Question: Apple recently released a new version of iTunes Connect.
I just want to change the primary language of my app, but the documentation (<https://developer.apple.com/library/ios/documentation/LanguagesUtilities/Conceptual/iTunesConnect_Guide/Chapters/DisplayInMoreLanguages.html> at the bottom) is now deprecated.

Anyone solved this problem?

[![enter image description here](https://i.stack.imgur.com/55D9K.png)](https://i.stack.imgur.com/55D9K.png)

Answer: 
I was able to change the primary language after being accepted by the appstore. 

Despite what the documentation says, it seems that changing the primary language is impossible in "Prepare for submission" state.
I had the same problem. My solution was to untick 'Use XXXCOUNTRYXXX Apple Watch' under 'Apple Watch' in Media Manager (and any others that may be ticked by default). I was then able to change the primary language.

[![Screenshot of tickbox](https://i.stack.imgur.com/BvFS4.png)](https://i.stack.imgur.com/BvFS4.png)