Mandarin

You may be looking for the Celestial Toymaker, who sometimes went by this name.

Mandarin was a dialect of Chinese. In the early 21st century, it was the most prominent language on Earth. About a billion people on Earth spoke Mandarin, three times more than the English language. (TV: Children of Earth: Day One ^[+]Loading...["Children of Earth: Day One (TV story)"])

The Fourth Doctor stated that he could speak Mandarin, among other Chinese languages. (TV: The Talons of Weng-Chiang ^[+]Loading...["The Talons of Weng-Chiang (TV story)"]) A version of the Doctor from a parallel universe could also speak Mandarin. (AUDIO: Sympathy for the Devil ^[+]Loading...["Sympathy for the Devil (audio story)"])

In 2011, Rex Matheson ran some footage through Central Intelligence Agency software to translate it from Mandarin to English. (TV: The Gathering ^[+]Loading...["The Gathering (TV story)"])