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Try adjusting it in [[MediaWiki:Mainpage]].

(In reply to comment #1)
> Try adjusting it in [[MediaWiki:Mainpage]].

> was already adjusted

(In reply to comment #0)
> If not, Нүүр хуудас appears as an article
> page, with the "From Wikipedia, the free Encyclopedia" line under pagename

That's because the CSS you're using to hide it assumes the main page is called "Main Page".

In [[MediaWiki:Common.css]], you have:
body.page-Main_Page #ca-delete {
    display: none !important;
}

and in [[MediaWiki:Monobook.css]]:
/* Don't display some stuff on the main page */
body.page-Main_Page #t-cite,
body.page-Main_Page #lastmod, 
body.page-Main_Page #siteSub, 
body.page-Main_Page h1.firstHeading {
    display: none !important;
}

You need to replace Main_Page with Нүүр_хуудас in these rules.