I noticed earlier there is "national pages" which can help player with their national language. But it there has been a lot of time I noticed these pages, and now have I something I want to ask with my own language.
Can someone tell me where are these national forums?
There are no "national forums" on the Combine site that I'm aware of. There's a page listing languages of players, who might be able to help you if you contact them, and there are a couple of communities related to specific nationalities (Russian, I'm pretty sure, I don't know who else), but I'm not sure where these are.