Univention Corporate Server 4.0 erratum 51 (bugfix)

* Adjusted the styling of the notification if JavaScript is disabled.
* A warning is displayed when using Internet Explorer in version <= 8
  along with a list of all supported browsers.
* A exception was logged in the JavaScript console when the grid was resized
  and when notifications got hidden. This was disturbing and has therefore
  been removed.
* The JavaScript method umc.tools.umcpProgressSubCommand did not send the
  UMCP flavor along with a request and could therefore fail due to
  insufficient permissions.
* If an outdated browser is being used, a message will be shown in the 
  login dialogue. A notification after the login will no longer show up.
* The icon on the policy reference button is now shown.
* Fixed a bug which prevented that UMC components could write into their
  logfiles.
* The "Favorites" category now toggles visibilty, depending on whether
  favorite modules are chosen or not.