How to change the system language across your whole Windows 10 PC

[Windows Central]

Sure, you can change the language on your Windows 10 account, but what about the entire PC? Here's how.
You computer has a default system-wide language set in Windows 10, but you don't have to be stuck with it if your needs are different. With Windows 10 you can set the language settings for single accounts through the Settings app, but what about setting it for all accounts, the Lock Screen, and everywhere else on your PC? For that you'll need the Control Panel.

Full story from the WindowsCentral blog...