How do I change or Add keyboard language in Android?

You can change the keyboard language on your Android from your phone's Settings app, or directly through the keyboard app. 

Changing the language of your Android keyboard is simple. You can swipe up on the app drawer and tap the Settings App. Scroll down to Language settings and tap Add a language. Choose the language you want from the list. You can then drag the language to the first position. You can also delete your temporary language. You can also change the language of your Android keyboard back to the default if you want to.

You can also add keyboard languages by bringing up your keyboard in an app and pressing the gear icon to access your Language settings.

When using your Android, you can change or switch out which language your keyboard uses through two quick shortcuts. You have set a new default language on your Samsung Keyboard. Using the Space bar swipe method, you can still switch between the language while typing.