The first time you set up Apple TV, you choose which display language and region format to use. You can change this later in Settings.
You can add multiple languages so that you can switch between languages when a keyboard appears onscreen. Keyboards appear in your preferred language order.
Go to Settings to switch to the next language in your list of languages.
Your primary language determines the language used throughout Apple TV and all apps that support the language.
Go to Settings on Apple TV.
Go to General > Region.
on Apple TV.
Go to General, then select Dictation to turn it on or off.