Barion locale(language also) select has not options, but it's required

Problem/Motivation

When I try to add a new payment gateway there is a select field on the form called "Barion locale(language also)". But the select does not contain options, so the form can not be saved

Steps to reproduce

- drupal core 10.3.1
- commerce_barion_payment 2.0-dev
- php 8.2
- add commerce_barion_payment module via composer and enable
- go to /admin/commerce/config/payment-gateways/add

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes