Have reloaded the mediawiki tarball, to ensure that the language files are OK, set a wgDebugLogFile and got the following output:
[116f798f] /DocuWiki/index.php?title=Special%3ASearch&search=db_arrayGet&redirs=1&profile=default Exception from line 311 of /var/www/wiki/mediawiki-1.20.2/includes/MagicWord.php: Error: invalid magic word 'speciale'
#0 /var/www/wiki/mediawiki-1.20.2/includes/MagicWord.php(236): MagicWord->load('speciale')
#1 /var/www/wiki/mediawiki-1.20.2/includes/parser/Parser.php(4765): MagicWord::get('speciale')
#2 /var/www/wiki/mediawiki-1.20.2/includes/parser/CoreParserFunctions.php(74): Parser->setFunctionHook('speciale', Array)
#3 /var/www/wiki/mediawiki-1.20.2/includes/parser/Parser.php(253): CoreParserFunctions::register(Object(Parser))
#4 [internal function]: Parser->firstCallInit()
#5 /var/www/wiki/mediawiki-1.20.2/includes/StubObject.php(79): call_user_func_array(Array, Array)
#6 /var/www/wiki/mediawiki-1.20.2/includes/StubObject.php(99): StubObject->_call('firstCallInit', Array)
#7 /var/www/wiki/mediawiki-1.20.2/includes/cache/MessageCache.php(829): StubObject->__call('firstCallInit', Array)
#8 /var/www/wiki/mediawiki-1.20.2/includes/cache/MessageCache.php(829): StubObject->firstCallInit()
#9 /var/www/wiki/mediawiki-1.20.2/includes/cache/MessageCache.php(807): MessageCache->getParser()
#10 /var/www/wiki/mediawiki-1.20.2/includes/Message.php(618): MessageCache->transform('$1 - {{SITENAME...', true, Object(Language), Object(Title))
#11 /var/www/wiki/mediawiki-1.20.2/includes/Message.php(436): Message->transformText('$1 - {{SITENAME...')
#12 /var/www/wiki/mediawiki-1.20.2/includes/Message.php(476): Message->toString()
#13 /var/www/wiki/mediawiki-1.20.2/includes/OutputPage.php(790): Message->text()
#14 /var/www/wiki/mediawiki-1.20.2/includes/OutputPage.php(833): OutputPage->setHTMLTitle(Object(Message))
#15 /var/www/wiki/mediawiki-1.20.2/includes/SpecialPage.php(589): OutputPage->setPageTitle('Search')
#16 /var/www/wiki/mediawiki-1.20.2/includes/specials/SpecialSearch.php(84): SpecialPage->setHeaders()
#17 /var/www/wiki/mediawiki-1.20.2/includes/SpecialPage.php(611): SpecialSearch->execute(NULL)
#18 /var/www/wiki/mediawiki-1.20.2/includes/SpecialPageFactory.php(494): SpecialPage->run(NULL)
#19 /var/www/wiki/mediawiki-1.20.2/includes/Wiki.php(290): SpecialPageFactory::executePath(Object(Title), Object(RequestContext))
#20 /var/www/wiki/mediawiki-1.20.2/includes/Wiki.php(536): MediaWiki->performRequest()
#21 /var/www/wiki/mediawiki-1.20.2/includes/Wiki.php(446): MediaWiki->main()
#22 /var/www/wiki/mediawiki-1.20.2/index.php(59): MediaWiki->run()
#23 {main}
any idea? --86.134.102.231 18:07, 23 December 2012 (UTC)