core/app/Providers/LaravelLocalizationServiceProvider.php

<?php namespace App\Providers;

use Illuminate\Support\Facades\DB;
use Illuminate\Support\ServiceProvider;
use Mcamara\LaravelLocalization\Facades\LaravelLocalization;

class LaravelLocalizationServiceProvider extends ServiceProvider
{
    public function register()
    {
        $languages = DB::table('languages')
                       ->get();

        $supportedLocales = [];
        if (empty($languages)) {
            $supportedLocales[config('app.locale')] = [
                'native' => env('LOCALE_NATIVE_NAME', config('app.locale')),
                'script' => env('LOCALE_SCRIPT', 'Latn'),
                'name'   => env('LOCALE_TRANSLATED_NAME', config('app.locale')),
                'code'   => config('app.locale'),
            ];
            // create default language
            DB::table('languages')
              ->insert($supportedLocales[config('app.locale')]);
        }

        foreach ($languages as $language) {
            $supportedLocales[$language->code] = [
                'native' => $language->native,
                'name'   => $language->name,
                'script' => $language->script
            ];
        }

        config([
                   'laravellocalization.supportedLocales'        => $supportedLocales,
                   'laravellocalization.useAcceptLanguageHeader' => true,
                   'laravellocalization.hideDefaultLocaleInURL'  => true
               ]);
    }

    public function boot()
    {
        \App::setLocale(LaravelLocalization::getCurrentLocale());
    }
}