How to Install and Uninstall Languages in Windows 10 (Guide from Microsoft)
You can download and install additional languages for Windows 10 to view menus, dialog boxes, and other user interface items in your preferred language using the Language Control Panel. This post will show you how to install and uninstall languages in Windows 10.
Add or Install Language on Windows 10
Open the Settings app > Time & Language. Here click on Region & language, to open the following panel.
Click on the Add a language setting and you will see panel open up, offering you languages that are available and can be installed on your computer. Select Japanese, and it will start downloading and you will see the following notification appear.
Here you can click on a Language and set a language as the default language for your system or Remove a language. You will also see an Options button and Remove button. You can see this in the first image above.
If you click on Add a language and then on the Options button you will see the following panel open up. Here you can download Language packs and add Keyboards.
Clicking on Options, offers you additional options. You can add other features like Keyboards, Fonts, Handwriting & Pen, OCR, Typing, Typing Pen and so on.
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