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: 
For those still having problems changing your primary language, you first need to submit a new version of your app which has at least 2 localizations (for me e.g. i started only with german and then german and english). German was my initial primary language.
As soon as the version is approved + ready for sale(dont forget to add the localization in your App-Information as well (add new language)) THEN you can change the primary language in the App information.

Sorry for my english, new here ;)
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)