Siemens SINUMERIK 840DE sl Commissioning Manual page 1472

Configuring the system
2.2 Configuring a customized operator interface
2. Select the "Languages" tab, in order to switch the language for the Windows XP user
interface. Under "Language used in menus and dialogs," select the new language and
confirm with OK.
3. On the "Advanced" tab, select the language for programs that do not support Unicode.
Result
To make the language change effective, the PCU must be rebooted. The selectable
languages are displayed using the font set of the respective language.
See also
How to install additional languages under Windows XP (DVD) (Page 84)
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Commissioning Manual, 02/2014, 6FC5397-1DP40-4BA0
PCU-Basesoftware (IM8)