Hello, I did a search and found the following foreign-language Binding of Isaac wikis. I'd like to recommend interlanguage linking them to your wiki.
This Russian wiki is currently correctly linked to this wiki. There's also a few straggler Russian wikis which I list for completion: they cannot be linked to this wiki without unlinking the large wiki. User:Elecbullet/Interlanguage
Note, only one wiki from each language can be linked. My suggestion is highlighted. User:Elecbullet/Interlanguage User:Elecbullet/Interlanguage User:Elecbullet/Interlanguage User:Elecbullet/Interlanguage
As the administrator of my own w:c:wolfenstein, I'd strongly advise you to have the four highlighted, unlinked wikis interlanguage linked to this wiki, the Russian wiki, and to each other. This will pretty much make them the official foreign-language versions of this wiki. It'll also enable you to place interlanguage links on every page, which adds a small link at the bottom of the page, in the Languages section (or the left, in Monobook). For an example, check out my Wolfenstein Wiki which is linked to 7 others.
You can do this yourself at Community Central, or you can give me permission to go ahead and take care of it myself. I do this for a lot of wikis so I guarantee I won't screw up. :] As said, I'd like to add German, French, Polish, and Spanish to the interwiki network, but if you'd prefer anything different that's cool by me.