The user with their battery. It's all in-device. No server is used.
Discussion
is this the feature of Android phone? or do you pack some offline-translating service into the app?
So why is it not in the FOSS version? I was thinking the non-foss use online service for translation, that's why I refused to use it mostly.
There are no FOSS language models to run in the device yet. Maybe one day.
Savage answer.
I am somewhat amazed now.