title: Remove default locale prefix in symfony routing components
body: <p>I work <strong>Only</strong> with symfony routing components in personal project(without full symfony framwork). my method is: add route in <code>routes.yaml</code> file like this:</p>
  
  <pre><code>index:
      path:     /test
      methods: GET
      controller: 'App\Catalog\Controller\Home\IndexController::index'
  
  register:
      path:     /test/account/register
      methods: GET
      controller: 'App\Catalog\Controller\Account\RegisterController::index'
  </code></pre>
  
  <p>my routing work fine But I need to add automatic locale prefix in uri/routing for multi language system like this:</p>
  
  <pre><code>mydomain/test    //for default language ie: en
  mydomain/test/fr
  mydomain/test/de
  mydomain/test/account/register      //for default language ie:en
  mydomain/test/fr/account/register
  mydomain/test/de/account/register
  </code></pre>
  
  <p>How do add locale prefix in <code>routes.yaml</code> file and remove default locale prefix language ?!</p>