Hi.
Depending on how much text there is, i might just have in code on the part where you can select language a bool test.
Then if true, show all language, if false show the 3 asian language.
Or depending on setup, if you have language manager as a prefab or scene.
Then you can swap that part before build.
for language manager i tend to use a global variable (gameobject) to reference, in that way its easier to swap as well as other fsms are referencing to the global variable and not directly to the language manager.