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Fulltext search for non latin keywords (for example russian) is broken. No hits
for search russian words, but english words search is O'k.

PostgreSQL version is 8.1.4 (backport for GNU/Linux Debian stable (Sarge))
MediaWiki 1.8.2.

In includes/SearchPostgres.php in parseQuery function statement is used:

$searchon .= $terms[1] . $wgContLang->stripForSearch( $terms[2] );

stripForSearch() function is located in languages/Language.php

The comment in the function is following:

# MySQL fulltext index doesn't grok utf-8, so we need to fold cases and convert
to hex

But if I rewrite this function in a simple way:

function stripForSearch( $string ) {
                return $string;
}

russian full text search is appeared. So I think for PostgreSQL this is s solution.

P.S. (btw) PostgreSQL 8.2 comes with tsearche2 extention with full multibyte
(UTF-8) support. So it's possible to init database with unicode locales. I
checked it with ru_RU.UTF-8 locale.