MediaWiki internal error.

Original exception: exception 'MWException' with message 'Magic word 'redirect' not found' in /data/wiki/wiki-de/languages/Language.php:1773
Stack trace:
#0 /data/wiki/wiki-de/includes/MagicWord.php(239): Language->getMagic(Object(MagicWord))
#1 /data/wiki/wiki-de/includes/MagicWord.php(192): MagicWord->load('redirect')
#2 /data/wiki/wiki-de/includes/Title.php(302): MagicWord::get('redirect')
#3 /data/wiki/wiki-de/includes/Article.php(893): Title::newFromRedirect('{{DAGV-Kopfzeil...')
#4 /data/wiki/wiki-de/includes/Wiki.php(447): Article->view()
#5 /data/wiki/wiki-de/includes/Wiki.php(63): MediaWiki->performAction(Object(OutputPage), Object(Article), Object(Title), Object(User), Object(WebRequest))
#6 /data/wiki/wiki-de/index.php(114): MediaWiki->initialize(Object(Title), Object(Article), Object(OutputPage), Object(User), Object(WebRequest))
#7 {main}

Exception caught inside exception handler: exception 'MWException' with message 'Magic word 'int' not found' in /data/wiki/wiki-de/languages/Language.php:1773
Stack trace:
#0 /data/wiki/wiki-de/includes/MagicWord.php(239): Language->getMagic(Object(MagicWord))
#1 /data/wiki/wiki-de/includes/MagicWord.php(192): MagicWord->load('int')
#2 /data/wiki/wiki-de/includes/parser/Parser.php(4098): MagicWord::get('int')
#3 /data/wiki/wiki-de/includes/parser/CoreParserFunctions.php(17): Parser->setFunctionHook('int', Array, 1)
#4 /data/wiki/wiki-de/includes/parser/Parser.php(175): CoreParserFunctions::register(Object(Parser))
#5 /data/wiki/wiki-de/includes/MessageCache.php(659): Parser->firstCallInit()
#6 /data/wiki/wiki-de/includes/GlobalFunctions.php(585): MessageCache->transform('$1 ??? {{SITENA...')
#7 /data/wiki/wiki-de/includes/GlobalFunctions.php(548): wfMsgGetKey('pagetitle', true, false, true)
#8 /data/wiki/wiki-de/includes/GlobalFunctions.php(454): wfMsgReal('pagetitle', Array, true)
#9 /data/wiki/wiki-de/includes/OutputPage.php(324): wfMsg('pagetitle', '<internalerr...')
#10 /data/wiki/wiki-de/includes/Exception.php(148): OutputPage->setPageTitle('<internalerr...')
#11 /data/wiki/wiki-de/includes/Exception.php(183): MWException->reportHTML()
#12 /data/wiki/wiki-de/includes/Exception.php(269): MWException->report()
#13 /data/wiki/wiki-de/includes/Exception.php(327): wfReportException(Object(MWException))
#14 [internal function]: wfExceptionHandler(Object(MWException))
#15 {main}