Backend: Add additional info to countdown widget in header

It would be helpful to get contextual information of the whole demo page resetting process when clicking on the 30 minutes countdown widget at the header bar of the TYPO3 backend. A dropdown with info about what the resetting means and how the user can proceed if (s)he wishes to use the demo longer, e.g. when being in the middle of a presentation.

As a next feature (not being part of this issue) this dropdown could then provide a button which allows to extend the lifetime of the current session.