сменить язык в апп стор

Did you already try these steps to change your AppStore region back?

...

• Open the Settings app. 
• Tap your name, then tap Media & Purchases.
• Tap View Account. You might be asked to sign in.
• Tap Country/Region.
• Select your new country or region.
• Tap Change Country or Region.
• Tap your new country or region, then review the Terms & Conditions.
• Tap Agree in the upper-right corner, then tap Agree again to confirm.
• Select a payment method and enter your new payment information and billing address, then tap Next. You must enter a valid payment method for your new country or region.

...

from: Change your Apple Account country or region - Apple Support

Изменение страны или региона для Аккаунта Apple - Служба поддержки Apple (RU)

Hello,

This may be a region setting issue and not an actual change in country unless you truly went through all the steps necessary do that (and will have to reverse them to change back). This can sometimes happen if you find a link on the web that points to an app or a media item in another country's iTunes Store. Here's how you can correct this:

Sign out of the iTunes Store [ Sign in to your Apple Account on the web or in your device settings - Apple Support ] and sign in again to get the iTunes Store region to match the region to which your Apple Account country is set, as described in this post: apple id is only valid in us store - Apple Community

1. Go to: Settings > Account > Media & Purchases > View Account > Country/Region

2. Make sure it is set to your normal country.

3. In the "Media & Purchases" menu, sign out and then sign in again.

The above is a simplified version of that in the support document 'Change your Apple ID country or region' ( Change your Apple Account country or region - Apple Support ) except you shouldn't need to do the extra steps involved as when you have done a true country change.