Based on the availability of STT, TTS, and translation models available to download in that github repo, a real-life babelfish is 'only' some glue code away. Wild times we're living in.
Edit:found a reference to it https://www.reddit.com/r/German/comments/ul0xgt/just_for_fun...
Some travelers stop off at an inn in the Swiss Alps, and they notice that are the various tables at the inn are other nationalities. They amuse themselves by listening in on the conversations (and displaying their stereotypes) - the Italians are all talking at the same time very loud and never stop moving their hands, the French are all arrogant artistes, the Danes are boring and only talk about the weather, and then they notice the Germans.
There was obviously a very important conversation going on with the Germans because one German would say something and every other German would stop and listen intently until they were done, and then another one would start up and every one would stop and listen intently until that one was done, but in following the conversation it became clear it was not because the conversation was important, but because the Germans were waiting to hear the verb to understand what was being said.
it is still hopeless, and much worse than the dictionary based, at gender/nums/dicleasions in general.
i sometimes use it just to not thing about the grammar in some languages, and most times I'm doing a surprised double take of something that would be completely inappropriate or offensive instead of my simple phrases.
Modern translation apps and GPS are godsends that make travel a million times easier. And they're free! It blows my mind. Traveling would be so much more incredibly difficult without them.
Maybe for more casual sentences and not so difficult text, they perform better, i haven't tried. Anyways, they are both better than nothing.