1.4.0 Collapsible: Icon dissapears when updating header

1.4.0 Collapsible: Icon dissapears when updating header

I have a project in JQM 1.3.2. This project uses a collapsible. For multi language I have to update the header and the content dynamically.

In version 1.3.2 this worked:
HTML
    <div id="idCollapsible" data-role="collapsible">
      <h3 id="idCollHead">OK!</h3>
      <p id="idCollCont"></p>
    </div>

JS
  $('#idCollHead').text('translation');

In 1.4.0 this no longer works. The icon dissapears. I tried a lot to fix this, but without success.

Please help!