title: How do you show value as a title in easyadmin bundle?
body: <p>in config.yml </p>
  
  <pre><code>edit:
                  title:  'editing %firstname% '
                  fields:
                      - {property: firstname, type: string}
                      - {property: lastname, type: string}
                      - {property: email, type: string}
                      - {property: password,type: password}
                      - {property: mobilenumber, type: string}
                      - enabled
  </code></pre>
  
  <p>i want the username to come up dynamically and %firstname% doesn't work.</p>