Thread:Project:Support desk/How do I transclude an interface message onto a page?

By which I mean: How can I put into a page some text that changes with language?

The specific problem is that I want the introductory material on a Category page to be displayed in the current interface language. An example is at http://horawiki.org/page/Category:Dances.

I tried but this doesn't work; it does transclude the page, but doesn't transclude  when the interface language is Hebrew.

I found my way to this page which gave me the idea to use. This (surprisingly) did the same thing, transcluding the page but not changing with interface, though it seemed inconsistent---sometimes it did seem to get the /he version. But maybe I'm missing an extension or something.

Is there not a standard way to do this?

http://horawiki.org/, MediaWiki 1.21.1, PHP 5.3.24 (cgi-fcgi), MySQL 5.0.96-log