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From what you are saying about not being able to even add content, I get the feeling that maybe you have overlooked the very basics. Even though XOOPS has the modules to handle articles bundled with the XOOPS package, you actually have to install the additional modules that take care of what you want.
The Sections module (I renamed it "Articles" in my site) will take care of much of what you want. Just go to "System Admin" and then "modules." You need to work with this quite a bit with the users permissions (to allow the groups you want to be able to access and/or read arcticles) and user groups (to create the different groups you want). I wouldn't worry about some of the fancier modules until I got comfortable with user permissions, block display and editing, and a whole lot of other basic XOOPS administration issues.
I'm sorry if this was too basic, but it looks to me like you're missing the basic steps before getting into whether you can display in Russian, etc.