This list is going to be a reference for confirmed Siri homekit commands in multiple languages. Discussions regarding new and unconfirmed commands are supposed to be held on slack in the #siricommands channel: https://homebridgeteam.slack.com/messages/siricommands

Please add languages of interest at will!

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Confirmed commands

Service	Action	English	German	French	Italian	Nederlands
Lightbulb	On/Off	Turn on/off the light [in room/zone]	Schalte das Licht [in Raum/Bereich] an/aus	Allume/Eteint [Nom-de-la-lumiére] [dans la-pièce/la-zone] ou Allume/Eteint [la-pièce/la-zone]	Accendi le luci[In una stanza/In una zona]	Doe het licht aan/uit [in de kamer/zone]
Switch	On/Off	Switch on/off the [service-name] [in room/zone]	Schalte [Service-Name] [in Raum/Bereich] an/aus	Allume/Eteint le [Nom-du-service] [dans la-pièce/la-zone]		Zet de [naam schakelaar] aan/uit [in de kamer/zone]
Thermostat	Query current temperature	What is the temperature in <room>	Wie warm ist es in <Raum> Wie hoch ist die Temperatur in <Raum>(1)	Quelle est la température [dans la-pièce/la-zone]		Wat is de temperatuur in [de kamer/zone]
Shutters	Up/Down		Öffne/Schließe die Jalousien in	Monte/Descend [Nom-du-rideau]	Abbassa/Alza la tapparella [nome]

(1) In German, the two questions lead to different results: "How warm is it in room X?" is ansered with just a number, such as "21" (meaning 21°C); whereas "What is the temperature in room X?" results in an answer freely translated to "The thermostat is set to 21 degrees celsius", sounding like it was supposed to be the answer to the question for the TARGET temperatur, however, the temperature given by Siri is always the CURRENT temperature.