title: Symfony2 intl only "en" supported
body: <p>I am working on windows machine with Wamp installed and PHP 5.4.3
  Currently, I am developing a web application using Symfony2. While creating a form with the FormType, I needed to insert an inputfield that takes a float instead of a String. So, I used this code:</p>
  
  <pre><code>-&gt;add ( 'weight', 'number', array (
              'label' =&gt; 'register.weight',
              'widget_addon' =&gt; array (
                      'text' =&gt; 'kg',
                      'type' =&gt; 'append' 
              ) 
      ) )
  </code></pre>
  
  <p>when I click on the submit button, this exception appears:</p>
  
  <blockquote>
    <p>The Symfony\Component\Intl\NumberFormatter\NumberFormatter::getSymbol() is not implemented. Please install the "intl" extension for full localization capabilities.</p>
  </blockquote>
  
  <p>So I activated the php_intl extension by deleting the corresponded ";" in my php.ini</p>
  
  <p>The previous exception disappears and everything goes well. </p>
  
  <p>However, when I change the "locale" parameter in the parameters.yml file from "en" to "fr", the following exception appears:</p>
  
  <blockquote>
    <p>Only the locale "en" is supported.
    500 Internal Server Error - InvalidArgumentException</p>
  </blockquote>
  
  <p>I am stuck with this exception for 2 days now. I could use some help.</p>