When I asked about speaking a different language within the same emote, it seemed I wasn't close to the only one to learn that there's a #Command to set what is in a set of quotes in a different language than the one you're currently speaking (thanks, the person who I haven't recognized yet, for that!), so it would make some sense to add that description to Help Speak!
Something to the effect of
If you wish to slide between languages within different sections of speech inside of the same emote, you can do so by prefacing that dialogue with #Language just inside the opening quotation. You will attempt to speak that language until the closing quotation mark, upon which you will resume speaking your default language, should you add more dialogue later in the emote.
Usage:
emote speaks in their default language: "Happy birthday," then switches to another: "#Tessouare to me!"