The script is available for download from http://gallery.technet.microsoft.com/How-to-change-the-system-39f06b1c. You can also use Microsoft Script Browser for Windows PowerShell ISE to download the sample with one button click from within your scripting environment.
This script sample can change the system display language in Windows.
Here is a scenario that in a company the default language of Windows is Japanese. But some system admins only knows Japanese but not English. And the other admins only knows English. The English admins usually go to regional setting in the control panel and change the display language to English. After they finish their tasks they need to set back the language to Japanese. And these steps are really time consuming. This script can help user to change system display language automatically.
You can find more All-In-One Script Framework script samples at https://aka.ms/onescriptingallery