feat: Update i18n configuration and add support for additional languages

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.

next.config.js

@@ -45,4 +45,4 @@ const nextConfig = (phase, { defaultConfig }) => {
   };
 };
  
-module.exports = withNextIntl(nextConfig);
+module.exports = {...withNextIntl(nextConfig), output: 'export'};