Translation:It is said.
I would ask Πώς να πω "σκύλος" στα γαλλικά; "How should/would/shall I say 'dog' in French?"
Yours would be a literal translation of "How do you (plural or formal) say 'dog' in French?", using the personal "you" rather than impersonal "you (= one, someone, anyone, me)".
The spelling of the phone greeting is different: "Λέγετε". It is actually the second person plural of the verb "λέω" (active voice) in the imperative, so when you say that you request that someone starts speaking. But you're using the formal (plural) form so it's polite enough. The phrase given above is the third person singular in passive voice. These are two of the most important verb endings in Greek, -τε and -ται, and two of the most misspelled, like you're and your in English.
¡Thank you so much Mizinamo!
I've just discovered the search box on the Duolingo forums, and other features I hadn't seen before here on the browser version of DL, because I had the page on a laaarge zoom in. I just made a search with the "etymology" query, and I can see there are LOTS of comments out there <3
¿Do you have any preferred resource for searching etymologies or word meanings?