Did anybody now how to swich from USA store to polish?

Change App Store

1. Tap "Settings"

2. Tap "iTunes & App Stores"

3. Tap on your Apple ID

4.Tap "View Apple ID"

5. Enter your user name and password.

6. Tap "Country/Region."

7. Tap "Change Country/Region"

8. Select the country/region where you are located; re-select country/region even if it is correct

9. Tap "Done".

Note: If the change doesn't take effect, sign out of account and sign in again.

Settings / iTunes & App Store / tap on your ID on top / choose View Apple ID / authenticate / Country/Region / Change Country or Region.