Univention Corporate Server 4.1 erratum 136 (bugfix)

This update addresses the following issue(s):
* App Appliances now ensure that the UCS domain they join has an activated
  license.
* The virtual keyboard to enter special characters now supports touch
  devices.
* The initial setup used a script to update the App Center files that failed
  under certain circumstances. Now a script is called that works in unjoined
  environments.