It's using a google library: `com.google.mlkit.nl.languageid.LanguageIdentification`.
See more at:
https://github.com/vitorpamplona/amethyst/blob/381db713ab3b6ea7cadbbd704c9646e4d78d9d24/app/src/mai...
Identification (and translation) is apparently on-device as described by the docs at:
https://developers.google.com/ml-kit
https://developers.google.com/ml-kit