Por favor empilhar as cadeiras no fim do dia (passive voice) Por favor empilhe as cadeiras no fim do dia (imperative)

Portuguese

Greek: Παρακαλώ στοιβαξτε της καρέκλες στο τέλος της ημέρας. And Albanian: Ju lutem vendosni karriget njëra mbi tjetrën në fund të ditës.

Finnish:

Pinoathan tuolit päivän päätteeksi, kiitos.

We don't have a word for please, so we usually add thank you for politeness.

"Пожалуйста, составьте стулья в стопку в конце дня" -- Russian;

You can do either "Молим вас, сложите столице на краjу дана" or "Molim vas, složite stolice na kraju dana" for Serbian

Portuguese: "Por favor empilhar as cadeiras ao final do dia"

🇰🇷 Korean: 일과를 마친 후 의자를 쌓아 주세요.

Greek:

Παρακαλώ στοιβάχτε τις καρέκλες στο τέλος της ημέρας.

Italian: "Per favore, aiutateci ad impilare le sedie alla fine della giornata"

Direct translation aside from "aiutateci" which means "help us" to make it more of a friendly request than a command - the verb goes into the indefinite form so it's not "aimed" at anyone. I think "lezione" (lesson) would work more naturally than "giornata" (day) as that usually means either sunset or when you go to bed

Hungarian: Kérlek szépen, pakoljátok egymásra a székeket a nap végén!

Note that the accents should be written perfectly vertically, not slanted

Spanish: "Por favor, apila las sillas al final del día." It can be more polite if you add a "Gracias" at the end to give thanks before hand: "Por favor, apila las sillas al final del día. Gracias."

Edit: you can change "apila" for "apile" to be even more polite. "Por favor, apile las sillas al final del día. Gracias."

走之前唔該疊翻好啲櫈

^Cantonese version. It means "Before you leave, please stack the chairs"

In Japanese I would say:

一日終わったら、椅子を重ねてください。