A EDITER !

https://superuser.com/questions/1537466/how-to-change-language-of-windows-10-single-language-without-format

https://superuser.com/questions/1725144/how-to-change-language-of-windows-11-single-language-without-format

https://leoguides.com/how-to-add-or-change-language-of-windows-11-home-single-language/

curl -o %TEMP%\Microsoft-Windows-Client-Language-Pack_x64_fr-fr.cab "https://filedn.com/lOX1R8Sv7vhpEG9Q77kMbn0/Windows11/LanguagePacks/Microsoft-Windows-Client-Language-Pack_x64_fr-fr.cab"
dism /online /Add-Package /PackagePath:%TEMP%\Microsoft-Windows-Client-Language-Pack_x64_fr-fr.cab
reg add HKLM\SYSTEM\CurrentControlSet\Control\Nls\Language /v InstallLanguage /t REG_SZ /d 040c /f
reg add HKLM\SYSTEM\CurrentControlSet\Control\Nls\Language /v Default /t REG_SZ /d 1036 /f
cd

https://www.elevenforum.com/t/generic-product-keys-to-install-or-upgrade-windows-11-editions.3713/