If you want to create a language mod for Chinese, Japanese or Korean you need to follow the How to create a language mod instructions first.
When you have your mod created you need to unzip inside the Ancient directory of your created mod this Font.zip (186.5 KB) file.
Now you have a preliminary Asian font support like the one we use in the credits section of the game.
We make a demonstration Asian.zip (215.9 KB) Mod with only the game menu translated to Chinese, Japanese and Korean.
You can put inside your [User]\Documents\Uncasual Games\Ancient Cities\Mod folder to test.