[TASK] Mitigate removed TSFE->getContext() method in `RenderTransla…

…tedFlagInFrontendPreviewMode`

TYPO3 removed quite some method of `TSFE` internal or removed them,
one of them `getContext()` can be mitigated easily.

This change retrieves the context either from TSFE or uses the
`GeneralUtility::makeInstance()` to retrieve it within the
`RenderTranslatedFlagInFrontendPreviewMode` PSR-14 event listener.

Classes/Event/Listener/RenderTranslatedFlagInFrontendPreviewMode.php

@@ -5,6 +5,8 @@
 namespace WebVision\Deepltranslate\Core\Event\Listener;
 
 use TYPO3\CMS\Core\Context\Context;
+use TYPO3\CMS\Core\Information\Typo3Version;
+use TYPO3\CMS\Core\Utility\GeneralUtility;
 use TYPO3\CMS\Frontend\Controller\TypoScriptFrontendController;
 use TYPO3\CMS\Frontend\Event\AfterCacheableContentIsGeneratedEvent;
 
@@ -18,7 +20,9 @@ final class RenderTranslatedFlagInFrontendPreviewMode
     public function __invoke(AfterCacheableContentIsGeneratedEvent $event): void
     {
         $controller = $this->getTypoScriptFrontendController($event);
-        $context = $controller->getContext();
+        $context = ((new Typo3Version())->getMajorVersion() >= 13)
+            ? GeneralUtility::makeInstance(Context::class)
+            : $controller->getContext();
         if (
             !$this->isInPreviewMode($context)
             || $this->processWorkspacePreview($context)