[experiments] Rename button is not working

We cannot anylonger rename a experiment with the "rename" button on the experiment display page. The button leads to no pop-up or similar.

When I click on the button, the JS console shows me:

Uncaught TypeError: Cannot set property 'value' of undefinedbeat.experiments.dialogs.show
  ExperimentRenaming @ dialogs.js?v0.13.0b3:977
  (anonymous function) @ (index):579
  m.event.dispatch @ jquery-1.11.1.min.js?v0.13.0b3:3
  r.handle @ jquery-1.11.1.min.js?v0.13.0b3:3

Possibly, also related to the label -> name changes.