To deal with game UI languages and translations in Unity easily, you can use this very simple language localization system.
Define your words translation in a script included in this package and make necessary configuration then you are done!
Contact me if you have any further question. Download it for free now.
Check out this video to see how it works:
Download it here:
https://creativeshop.ciihuy.com/product/game-language-changer-system-for-unity-localization/