Something like a "translation computer" exists since the early 2000s.
But it does not really translates. The user just chooses a phrase from a database, and the device plays a pre-recorded translation.
It is in use by US Forces (and the LAPD).
It seems to be useful in emergencies, but in every day life, it even hampers communication, as the users do not try to understand each other, they just scroll for phrases in the database. Which also is a comment on our modern society.
But it brings up some adventure possibilities. What if a saboteur tampers with the database, so that the wrong phrases are chosen?
"My hovercraft is full of eels" would only be the beginning.
https://en.wikipedia.org/wiki/Phraselator