Q: Change appstore language

Hi,

I live in Switzerland and i have a swiss apple id with my credit card attached.

But all my entire phone is in English and the App Store is in German. I search on Google and i saw on this page iTunes: Changing the display language - Apple Support that in Switzerland we have 3 options: English, German, French.

How can i jump between the available languages for my app store? I tried to reproduce the steps on tutorial and when i select United Kingdom the interface changes to English, but when i back to Switzerland again it goes to german without asking me if i want to keep my language or if i want french for example.

How can itunes detect if i speak french or german? And italian person? Do you know that part of Switzerland speaks italian? They have all a german appstore?

Hope that apple have a hidden option to change the language to english...