laravel 5.8 language localization not working in my project

i made this localization before in another project , but this project i changed in admin middleware to make permissions for users in dashboard. this project is for two languages arabic and english it is working fine in website out admin but in admin i don't know what is the problem in my code.

now localization not working

this is my route:

Route::namespace('admin')->group(function (){
   Route::group(['middleware'=> ['web','admin']], function (){
       Route::prefix('admin-123')->group(function (){

           Route::get('locale/{locale}', function ($locale){
               \Illuminate\Support\Facades\Session::put('locale', $locale);
               return redirect()->back();
           });

and this is my middleware:

<?php

namespace App\Http\Middleware;

use App\user_permission_group;
use Closure;
use Illuminate\Support\Facades\App;
use Illuminate\Support\Facades\DB;
use \Illuminate\Support\Facades\Request;
use Illuminate\Support\Facades\Auth;

class admin
{
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
        if(!auth()->check()){
            return redirect('login');
        }

        if(Auth::user()->admin > 2)
        {
            return redirect('/');
        }

        $url = Request::fullUrl();

        $lang = explode('admin-123/locale/', $url);
//        dd($lang[1]);
        if (isset($lang[1]) && $lang[1] !='')
        {
            App::setLocale($lang[1]);
//            Session::put('locale', $lang[1]);
        }

        $admin = explode('admin-123', $url);
        $permission = explode('/', $admin[1]);

        if (isset($permission[1]) && $permission[1] !='' && $permission[1] != 'locale')
        {
            if (Request::is('admin-123/' . $permission[1] .'/*')) {
                $permissions = DB::table('permission_group_details')->select('group_id')->where('permission', $permission[1])->get();
                if ($permissions->count() > 0)
                {
                    foreach ($permissions as $per)
                    {
                        $gr_id[] = $per->group_id;
                    }
                    $grid = collect($gr_id);
                    $users = user_permission_group::where('user_id', Auth::user()->id)->whereIn('group_id', $grid)->first();

                    if (!isset($users)){ return redirect()->back(); }

                    $permission_route = DB::table('permission_group_details')->select('permission')->where('group_id' , $users->group_id)->first();
                    if (!isset($permission_route) && $permission_route =='')
                    {
                        return redirect()->back();
                    }
                }
                else{
                    return redirect()->back();
                }
            }
        }

        return $next($request);
    }
}

and this is my blade :

@if(\Illuminate\Support\Facades\App::isLocale('en'))
        @php
            $lang = 'English';
            $pull_right = '';
            $pull_left = 'pull-right';
            $rtl ='';
            $title = 'title';
            $currency = 'EGP';
            $pull = 'pull-left';
        @endphp
    @else
        @php
            $lang = 'العربية';
            $pull_right = 'pull-right';
            $pull_left = 'pull-left';
            $rtl ='rtl';
            $title = 'title_ar';
            $currency = 'جنيه';
            $pull = 'pull-right';
        @endphp
    @endif

        
    <li class="dropdown dropdown-small">
       <a href="#" class="dropdown-toggle" data-hover="dropdown" data-toggle="dropdown"><span class="value"> </span><b class="caret"></b></a>
          <ul class="dropdown-menu" style="padding: 0.5rem 1.5rem !important; margin: 0.125rem 5px 0 !important;">
               <li><a href="">English</a></li>
               <li><a href="">العربية</a></li>
           </ul>
    </li>

please help.. thanks for all

via Chebli Mohamed