title: changing unloadConfirmation message for modal windows in Apache Wicket
body: <p>If you close the window when using ModalWindows in wicket, you get this message:</p>
  
  <pre><code>"Reloading this page will cause modal window to disappear"
  </code></pre>
  
  <p>Is there a way to configure this to show OTHER message? (for i18n purposes)
  Thanks a lot!!<br>
  Manuel</p>