$lang = $controller->guessLanguage();
header("Location: " . $lang . "/");
} else {
if (array_key_exists($parts[2], $config->getLanguages())) {
$lang = $parts[2];
$content_lang = $request->getQueryParam('clang') ? $request->getQueryParam('clang') : $lang;
$request->setContentLang($content_lang);
$request->setLang($parts[2]);
$request->setPage($parts[3]);
if (!$request->getPage()) {
$request->setPage('vocab');
$controller->invokeVocabularyHome($request);
} elseif ($request->getPage() == 'feedback') {
$controller->invokeFeedbackForm($request);
} elseif ($request->getPage() == 'search') {
$controller->invokeVocabularySearch($request);
} elseif ($request->getPage() == 'index') {
if (sizeof($parts) == 5 && $parts[4] !== '') {
// letter given
$request->setLetter($parts[4]);
}
$controller->invokeAlphabeticalIndex($request);
} elseif ($request->getPage() == 'page') {
$request->getQueryParam('uri') ? $request->setUri($request->getQueryParam('uri')) : $request->setUri($parts[4]);
if ($request->getUri() === null || $request->getUri() === '') {
$controller->invokeGenericErrorPage($request);
} else {
$controller->invokeVocabularyConcept($request);
}
} elseif ($request->getPage() == 'groups') {
if (sizeof($parts) == 4) {
