Neat idea actually, but we have a problem there >_<
Looking at the supported text frameworks, i see no support for the legacy GUIText. This is actually how I make the text appear in Milky Ways.
So, this method would not work, unfortunately.
But… The idea is good to be honest, I could implement it in my next game which I am currently creating.
I can instead use something like :
https://assetstore.unity.com/packages/tools/simple-google-cloud-translation-8599...
(written into my to-do list for later.)