Well, I just make a short introduction about the function:
The administrator of the site publish an English post(or in other language),The post will be cut out by paragraphs. All the registered users can translate the post by one or more paragraph and submit their translation of the post to Chinese.After the administrator verified someone’s translation,it will published.
Also the translator can change what he/she posted about the post.Below are some screen about the function.
1.This is the posts list sample:
2.If multiply users translated the same paragraph,we can see all translations by clicking the link beside to expand them.
3.If some paragraph has not been translated,registered users can click the button to translate it.
4.In the editor,we can type our translation,once done,submit our translation by click the button on the right top
You might want to rethink this, unless you can find an admin, who can speak every language you want to offer on this site.
What you are looking for is a script to crowdsource translations. I did some searching and not sure this will help you, as the back-end is actually a service, but it might.