title: Symfony : These messages are not available for the given locale and cannot be found in the fallback locales
body: <p>I'm trying to use symfony translations. Here is my translation.yml</p>
  
  <pre><code>framework:
      default_locale: 'en'
      translator:
          paths:
              - '%kernel.project_dir%/translations'
          fallbacks: ['en']
  </code></pre>
  
  <p>I have created messages.en.yml in translations directory. </p>
  
  <pre><code>## YAML Template.
  Home: Home
  Admin: Admin
  Dashboard: Dashboard
  Vehicles: Vehicles
  Id: Id
  </code></pre>
  
  <p>But when I try to use like this,</p>
  
  <pre><code>{% trans %}Dashboard{% endtrans %}
  </code></pre>
  
  <p>I get this error message,</p>
  
  <blockquote>
    <p>These messages are not available for the given locale and cannot be
    found in the fallback locales. Add them to the translation catalogue
    to avoid Symfony outputting untranslated contents.</p>
  </blockquote>