I updated ISPConfig 3.0.1.2 to ISPConfig 3.0.1.3 in Ubuntu 8.10!Found that the language cound't be changed!!!It always show English!!!
Changing the langugae works fine for me in 3.0.1.3. Make sure that you have set the correct language in the config.inc.php file for the server and the interface. There was a bug in 3.0.1.2 that this etting could had been lost.