My only advise that i will give it to you is to download google translate add-on if you are using google chrome
https://chrome.google.com/webstore/detail/google-translate/aapbdbdomjkkjkaonfhkkikfgjllcleb?utm_source=chrome-ntp-icon
Firefox
go to Open menu then add ons then search for google translate and install one
other
use google translate but it is the worst method
Edit: or wait for another reply maybe someone have a better way
How to translate the wiki is described at https://powdertoy.co.uk/Wiki/W/Translations.html
Polish translations should use the same page name as the original English pages, but with "/pl" on the end. For example, the Polish version of https://powdertoy.co.uk/Wiki/W/Hotkeys.html is at https://powdertoy.co.uk/Wiki/W/Hotkeys/pl.html
Ah, thank you. Now I know how to translate the wiki into Chinese. I'm going to do it.
I have done the translation of https://powdertoy.co.uk/Wiki/W/Translations.html.
I thought I can translate the side bar of the wiki. (also the title of my translated pages and the edit page, "Read" "Edit" "View history" buttons. I would like to translate everything in the wiki)
What happened?
https://powdertoy.co.uk/Wiki/W/Elements:Walls/zh-hans.html
Look at the language list. It shows that the page is English - the Chinese Simplified is not in the language list!
EDIT: It's fixed, probably a cache issue