This setting only changes the language of the Calaos Home interface, the one displayed on the touchscreen connected to the server.
It does not change:
This is the most common misunderstanding: changing this setting will not translate your whole installation.
Open the Calaos Home configuration screen and choose the language you want. The change is visible immediately.
This is the only place where this setting can be changed, and it only makes sense if a screen is connected to the server.
This setting does not concern you: without a screen, Calaos Home is not used.
The language of your mobile applications follows your phone’s, and that of Calaos Installer is set directly in the software.