Galatian language is a type of language that people used to speak a long, long time ago in a place called Galatia. Galatia was a region in what we now call Turkey.
The people who spoke Galatian were called Galatians. They were a group of people who came from a different place but they moved to Galatia and started living there. Just like how some people move to a different country and start living there.
Galatian language was a little bit different from other languages spoken in the area at that time. Some people who study languages called linguists are still trying to learn more about it because there aren't many written records of it.
Today, people don't speak Galatian anymore. Many centuries have passed, and other languages have become more popular. However, scientists and historians still find it very interesting to learn about it because it tells us about the people who used to live in the area a long, long time ago.