Macros

If you want to send a message using Polyglot, here's a few things you need to pay attention:

Chat Messages

The message needs to be sent In Character, so it has to be of the type CONST.CHAT_MESSAGE_TYPES.IC. It can also be OOC or WHISPER if you toggled the Scramble OOC Chat Messages setting.
You can append a lang or language key into the object parameter of the ChatMessage.create() function to make a message to be spoken in that language. The value can be either the key or the value of the of language (e.g. if you have a language set as "dwarf": "Dwarvish", you could use either).

Example

ChatMessage.create({
	user: game.userId,
	speaker: ChatMessage.getSpeaker(),
	content: "Hello world",
	type: CONST.CHAT_MESSAGE_TYPES.IC, //2
	language: "dwarvish"
})

Chat Bubbles

This used to be canvas.hud.bubbles.say() until V10 changed it.

If you want tokens to speak without sending chat messages, you need to send a language key as part of the options parameter.

Examples

let message = "Hello world"
let options = {
	//other data
	language: "dwarvish"
}
await canvas.hud.bubbles.broadcast(token, message, options);

Or this in case you aren't using emotes at all.

let message = "Hello world"
await canvas.hud.bubbles.broadcast(token, message, {language: "dwarvish"});