title: How can I put the asterisk of my required field on my label? (Symfony form)
body: <p>I am working on Symfony 3 and I have some trouble with my form.</p>
  
  <p>When I create a Symfony form with a field not required, here is my code :</p>
  
  <p>I create the form :</p>
  
  <pre><code>$form = $this-&gt;createFormBuilder()
    -&gt;add('prenom' TextType::class, array(
      'label'    =&gt; 'Votre prénom',
      'required' =&gt; false
    )
    -&gt;getForm();
  </code></pre>
  
  <p>Here is the code in my view for this field:</p>
  
  <pre><code>{{ form_label(form.prenom) }}
  {{ form_errors(form.prenom) }}
  {{ form_widget(form.prenom) }}
  </code></pre>
  
  <p>And this is the HTML I have :</p>
  
  <pre><code>&lt;label class="control-label" for="contact_prenom"&gt;Votre prénom&lt;/label&gt;
  &lt;input type="text" id="contact_prenom" name="contact[prenom]" class="form-control"/&gt;
  </code></pre>
  
  <p>Now if I do the same without the <code>'require' =&gt; false</code> on my <strong>FormBuilder</strong>, here is the HTML I get:</p>
  
  <pre><code>&lt;label class="control-label required" for="contact_prenom"&gt;Votre prénom&lt;/label&gt;
  &lt;sup class="required" title="Champ obligatoire"&gt;
          &lt;i class="fa fa-asterisk"&gt;&lt;/i&gt;
  &lt;/sup&gt;
  &lt;input type="text" id="contact_prenom" name="contact[prenom]" required="required" class="form-control" /&gt;
  </code></pre>
  
  <p>Is it possible to control the "sup" tag so the asterisk <code>*</code> can be with my label?</p>
  
  <p>I guess I can do it with jQuery, but I'd like to know if <strong>it is possible to do it on my form builder or in Twig?</strong></p>