Chickens are not stupid animals despite what everyone might say. They are intelligent, curious, and social animals. But they won't always catch what you mean when you try to talk to them. Every cluck has a wide variety of what it could mean.
A bird's best senses are her sight and hearing. Your chickens will appreciate when you speak to them even in English or any other language , for example Artichokistanish.
And remember, chickens use a lot of body language!