It depends on what kind of work needs to be done or how many people you are talking to; but for simplicity, we can just say this:
"Sei ruhig und verrichte deine Arbeit."
Ruhe
Since English is a Germanic language , and the German word for quiet is schweigen , and pronounced
"Sei still und küss mich"
Wirst du arbeiten? means will you work in German
Arbeit
ruhig
Common translations are "Sei still", and "Sei ruhig"
To say "be quiet" in Polish, you can say "Bądź cicho."
Urlaub Hausaufgaben is the translation in German. It is translated from English to German. German is mostly spoken in the European countries.
Arbeit macht frei
The Irish for quiet is "ciúin".
"Quiet" in Hawaiian is "maluhia."