According to the fact that iTunes Connect was changed not long time ago to App Store Connect, I can't find how to add localization language in App Store Connect, right now I see only English language there, how to add other languages there? I want to localize app description for different countries.

Nothing really changed between App Store Connect and iTunes Connect when it comes do adding and removing languages/localizations.
Your app needs to be in an editable state for you to be able to do this:
Language: The language you choose to localize your metadata. This property is editable depending on the app status.
If you cannot add/delete languages, simply create a new version of the app. The changes will only be active on the store, once the new version is approved by Apple and live.
Source: https://help.apple.com/app-store-connect/#/devf29afbb74
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