[BUGFIX] Invalid ClearLanguageCacheMenuItem::clearCache()

Method clearCache() is not found in ClearLanguageCacheMenuItem(),
but in LanguageCacheClearer.

Change-Id: Ibd48cbba78182563c8decc8f09cfc41c3f75a923
Fixes: #40451
Releases: 6.0
Reviewed-on: http://review.typo3.org/14232
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn

typo3/sysext/lang/ext_localconf.php

@@ -14,7 +14,7 @@ if (isset($GLOBALS['TYPO3_CONF_VARS']['SYS']['lang']['cache']['clear_menu']) &&
 	$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['additionalBackendItems']['cacheActions']['clearLangCache'] = 'TYPO3\CMS\Lang\ClearLanguageCacheMenuItem';
 } else {
 	// Clear l10n cache when the user clears all caches
-	$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/class.t3lib_tcemain.php']['clearCachePostProc']['clearLangCache'] = 'TYPO3\CMS\Lang\ClearLanguageCacheMenuItem->clearCache';
+	$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/class.t3lib_tcemain.php']['clearCachePostProc']['clearLangCache'] = 'TYPO3\CMS\Lang\LanguageCacheClearer->clearCache';
 }
 // Register Ajax call
 $GLOBALS['TYPO3_CONF_VARS']['BE']['AJAX']['lang::clearCache'] = 'TYPO3\CMS\Lang\LanguageCacheClearer->clearCache';