This is pretty cool, can save a lot of time in some cases, and doesn't disappoint because object recognition (even by humans) is unreliable by nature.
>use an online translator to translate almost anything in any language (including idioms) using something like google translate
That's debatable at best. Google Translate at least is still horrible, to the point where it is actually pretty much completely useless, at translating Asian languages to English. For longer texts, even German to English or Spanish to English produces a lot of nonsense, although it is usually at least somewhat intelligible if you're familiar with the sort of mistakes that Google Translate tends to make.
Anecdotally, I don't use Google Translate any differently than I did 7 years ago. It's good for single words or expressions, it's okay for single sentences if you are aware of it's pitfalls, it's pretty useless for large articles unless all you want is getting a general idea of what the article is talking about.
>AI Dungeon
I mean everything we've seen from AI Dungeon was hilarious because of it's nonsensical flaws. If those flaws can somehow be removed in the future we'll be stuck with a version where every individual sentence kind of makes sense but there is no coherent connection or story line, i.e. a product that nobody would use.