1CM2 wrote:
Does the "ch" in the model number mean it's a Chinese version?
Yes. that's what it means.
Is there any way to get this to be fully in English?
The display language is not related to the country of sale of the device.
If you changed the language in Settings ➜ General ➜ Language & Region to something else, it should change everything, unless your fried did not correctly wipe the iPad and there are still apps and other things downloaded form the Chinese app store. In that case, those may remain in Chinese.
Your friend should have completely wiped the iPad by following the steps in the support document linked below.
click here ➜ What to do before you sell, give away, or trade in your iPhone or iPad - Apple Support