9.4.3. Language Support 
The feature works with the language of the home switch. That means
that menu and display texts, which are controlled by the switch software,
are displayed in the switch language („Please dial“, „Enter password“,..).
Any messages controlled by the phone firmware (directly, not switch
dependent) are only English („Cancel logoff“ , „logging on to home...“).
If the switch language is not set to English, texts are displayed
in two languages.