[BUGFIX] Compatibility fix for the LanguageService namespace

Classes/ViewHelpers/Backend/ControlViewHelper.php

@@ -32,9 +32,9 @@ use TYPO3\CMS\Backend\Clipboard\Clipboard;
 use TYPO3\CMS\Backend\Utility\BackendUtility;
 use TYPO3\CMS\Core\Imaging\Icon;
 use TYPO3\CMS\Core\Imaging\IconFactory;
-use TYPO3\CMS\Core\Localization\LanguageService;
 use TYPO3\CMS\Core\Page\PageRenderer;
 use TYPO3\CMS\Core\Utility\GeneralUtility;
+use TYPO3\CMS\Core\Utility\VersionNumberUtility;
 use TYPO3\CMS\Extbase\Utility\LocalizationUtility;
 use TYPO3\CMS\Recordlist\RecordList\DatabaseRecordList;
 
@@ -77,7 +77,12 @@ class ControlViewHelper extends AbstractViewHelper {
 		$pageRenderer = GeneralUtility::makeInstance(PageRenderer::class);
 		$pageRenderer->loadRequireJsModule('TYPO3/CMS/Backend/AjaxDataHandler');
 		$pageRenderer->addInlineLanguageLabelFile('EXT:backend/Resources/Private/Language/locallang_alt_doc.xlf');
-		$languageService = GeneralUtility::makeInstance(LanguageService::class);
+		if (version_compare(VersionNumberUtility::getCurrentTypo3Version(), '9.0.0', '<')) {
+			$languageService = GeneralUtility::makeInstance(\TYPO3\CMS\Lang\LanguageService::class);
+		} else {
+			$languageService = GeneralUtility::makeInstance(\TYPO3\CMS\Core\Localization\LanguageService::class);
+		}
+
 		$languageService->includeLLFile('EXT:backend/Resources/Private/Language/locallang_alt_doc.xlf');
 
 		$databaseRecordList->currentTable = $sortingData;