Update LaravelLocalization.php

Fix the LaravelLocalizationRoutes(it's not work with group -> get routes)
example:
Current url: http://localhost.dev/es/autenticacion/iniciar-sesion/
Getting the url to another locale: 
LaravelLocalization::getLocalizedURL('en') return -> http://localhost.dev/en/autenticacion/iniciar-sesion/
With the fix return -> http://localhost.dev/en/auth/login/