redirect()->back() is not working when I switch another language

I used barryvdh/laravel-translation-manager for localization in laravel 5.1, It is working fine and nice package. Now I am facing translation text is not working with return redirect()->back() in laravel 5.5.

Route::get('lang/{locale}', function ($locale) {
  \App::setLocale($locale);
  \Session::put('langKey', $locale);
  // return redirect()->back();
  return view('welcome');
});

It is worked well if I use return view('welcome') but not worked for redirect(). Please help me :('

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