Can you provide the source documentation and toolset used to edit the documentation available to the public?

Hey, look what they are doing in Unity! They translate the documentation into seven languages ​​(Japanese, Korean, Spanish, Portuguese, Chinese, Danish and Russian). Here’s a site, it is open to all comers …
http://translate.unity3d.com/#/manual/AnimationGlossary
Please, provide at least the source of this documentation:

and software which You use to build it in web…
In this case everyone can translate the documentation for themselves…