The code changes include:
- Updating the i18n configuration to export the `SUPPORTED_LANGUAGES` array.
- Refactoring the `getRequestConfig` function to accept a `locale` parameter.
- Simplifying the logic for determining the `locale` based on the `accept-language` header.
- Loading the appropriate messages file based on the `locale` parameter.
This commit improves the i18n functionality of the project and allows for easier addition of new languages.