Question How to hide different category

Hi. I have multilanguage forum and want to hide some category from users. For example, have two category: "Russian support" and "English support". I'd like to hide "Russian support" category for eng forum and hide "English support" category for rus forum. How I to do that? Thx a lot in advance!

Is there any ideas?

Do you understand the German language? Maybe this guide will help you.
www.kunena.org/docs/Kunena_mehrsprachig

This is a very custom issue so it is hard to convey a solution to a unique problem. We do not provide support for these type of issues that are "How tos" unless there is already an option given in Kunena to deal with that.

However I would recommend splitting your user base into separate ACL groups. You can find how ACL groups work here on the Joomla Docs Website:
docs.joomla.org/J2.5:Access_Control_List_Tutorial

Then you can configure you Kunena categories to only allow specific groups.

To do all this is all out of scope of what support we can provide. Once you get the structure set up how you want it though, I recommend you try to work with Kunena category manager and try to set up specific categories that only usergroups have access too.