It's only at first glance it seems that the definition of the system language in Windows 10 procedure is not so important, but if you understand it, then it is possible to achieve much more than you imagine, and all because It is thanks to this procedure, you can use the installation of new language packs. Thus, you can literally in a few minutes change the localization of the operating system interface.
Use the console utility DISM to determine the system language in Windows 10
Simply, launch the command line, but only on behalf of the Administrator and write the following command to it: "dism / online / get-intl". If everything is done correctly, then after a few moments, you will see the result obtained from the work done. It is the line called "Default UI Language" and will point to the system language of your Windows 10. 
Use the PowerShell console to determine the system language in Windows 10
Here, you have to start the PowerShell console itself and again, on behalf of the Administrator. After starting the console, run the following command: "[CultureInfo] :: InstalleduICulture". 
In this case, a value named "DisplayName" will just tell you which system language your OS has. Here, the parameter "LCID" will contain the code of the programming language itself.
Use the Registry Editor and the decoding table to determine the system language in Windows 10
As always, use the "regedit" command to open the "Registry Editor" of the operating system. In the editor, you need to go through the following path: "HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Control \ Nls \ Language".
In the right column, look for the term parameter, which has the name "InstallLanguage" and view its numerical value. 
When you see four bar code, you should use the decoding table on MSDN. If we consider the example in the screenshot with the digital value "0419", then it fully corresponds to the Russian language Win 10. 
We hope that this article was more than useful for you, and therefore, the definition of the system language in Windows 10 is no longer a problem for you and you can easily cope with such tasks as quickly as possible, whenever possible Wherever you need it.
