Mandarin

Mandarin was a language spoken in China. (TV: The Gathering) In the 21st century, it was the most prominent language on Earth. (TV: Children of Earth: Day One) The Fourth Doctor stated that he could speak Mandarian, among other Chinese languages. (TV: The Talons of Weng-Chiang) Rex Matheson ran some footage through Central Intelligence Agency software to translate it from Mandarin to English. (TV: The Gathering)