@amberage @freddy @shtrom none of those details disqualifies the feature from being deep learning, which it is. It's just not the particularly stupid and wasteful service-subscription variety that is currently gobbling up money/attention from credulous fools.
The Translations feature is powered by models trained on language pairs (i.e. language A<->B) and the more narrow domain is very effective. It does have some data availability problems, but it's been a success IMO.
https://firefox-source-docs.mozilla.org/toolkit/components/translations/