DefaultLocale.php

<?php
/**
 *
 * Detect country based on CloudFlare HTTP_CF_IPCOUNTRY headers
 * Set Default language for specific region
 *
 * See: https://support.cloudflare.com/hc/en-us/articles/205072537
 */

namespace App\Http\Middleware;

use App;
use Closure;
use LaravelLocalization;

class DefaultLocale
{
    public function handle($request, Closure $next)
    {
        // Get locale from URL
        $url_locale        = $request->segment(1);
        $supported_locales = config('laravellocalization.supportedLocales');

        // If locale code already exists and valid
        if (in_array($url_locale, array_keys($supported_locales))) {
            return $next($request);
        }

        // Get country code
        $country   = $request->server('HTTP_CF_IPCOUNTRY');
        $country   = strtoupper($country);
        $appLocale = App::getLocale();

        // Country -> Locale
        $mapping = collect([
            'RU' => 'ru',
            'UA' => 'ru',
            'BE' => 'ru',
            'KZ' => 'ru',
            'UZ' => 'ru',

            'US' => 'en',
            'UK' => 'en',
            'GE' => 'en',
            'DE' => 'en',
            'IR' => 'en',
            'FR' => 'en',
            'IN' => 'en',
            'AE' => 'en',

            'AZ' => 'az',
            'TR' => 'az',
        ]);

        if ($mapping->has($country)) {

            $country_locale = $mapping->get($country);

            if ($country_locale != $appLocale) {
                LaravelLocalization::setLocale($country_locale);
                App::setLocale($country_locale);
            }
        }

        return $next($request);
    }
}