To use this feature as described in 2022 guides, follow these steps:
Use the "Do Not Translate" list to select languages you already understand so the button doesn't appear unnecessarily. Why This Mattered in 2022
Once enabled, you can simply tap a message (or long-press on iOS) and select "Translate" to see the text in your preferred language.
The app automatically recognizes the language of the incoming message and offers to translate it if it differs from your system language.