title: Symfony Form required true
body: <p>I have form and for field 'firstname' use required true, how override standard message - "please fill out this field"  ? </p>
  
  <pre><code>        $builder
          -&gt;add('firstname', null, array('label' =&gt; 'First Name', 'max_length' =&gt; 255, 'required' =&gt; true))
  </code></pre>
  
  <p>In my entity field nullable  = true. If I want validate entity I know about      * @Assert\NotBlank(massage: "custom message"). But I 'required' => true only in form not entity (because need this for some api) And my question how change custom message if I validate field only in form </p>