This wikiHow teaches you how to add multiple languages to your Samsung Galaxy keyboard.
Step

Step 1. Open Settings on Samsung Galaxy
Find and touch the icon

in the Apps menu to open Settings.
-
Alternatively, swipe down on the notification bar from the top, then tap the icon
located at the top right of the screen.

Step 2. Scroll down the screen and tap General management
This option is at the end of the menu.

Step 3. Touch Language and input
The language and keyboard settings for the Samsung Galaxy will be opened.

Step 4. Touch Virtual keyboard
A list of all installed keyboard apps will be displayed.

Step 5. Touch Samsung keyboard
Samsung's default keyboard settings will be opened.

Step 6. Touch Languages and types
All available language options will be displayed.

Step 7. Touch the Add input languages button
It's next to the " +" is green at the bottom of the list of available languages.
Depending on the version of Android you're using, this button may say Manage input languages.

Step 8. Select the desired language by sliding the toggle to
When activating the language in the menu here, you can change the keyboard to this language in any application.