How to change the language of Windows Server 2019
If you have chosen to install Windows Server 2019 on your Dedibox, and wish to change the language, this document shows you how.
Log onto your Windows Server’s graphical interface (via Remote Desktop or similar).
Click the Start menu and then the gear icon to open the Settings Interface.
Click Time & Language (Heure et langue in French)
Click Language in the side panel on the left (Langue in French)
Click Add a language on the Language screen (Ajouter une langue in French). The Choose a language to install (Choisir une langue à installer) screen displays.
Select a language from the list, and click Next (Suivant). The Install language features (Installer des fonctionnalités linguistiques) screen displays.
Check the box next to the features you want, and click Install (Installer). The system connects to the Internet to download and install the language pack.
When the process is finished you are alerted. You will see the language under Windows display language. It may not take effect as the display language until after you reboot your server.