[BUGFIX] Fix broken templates when fetched from registry

Classes/Controller/MailController.php

@@ -141,6 +141,8 @@ class MailController extends AbstractController {
 					$language
 				);
 				$template = GeneralUtility::makeInstance(Template::class);
+				$template->setSiteLanguage($language);
+				$template->setPid($this->getPid());
 				$this->templateRepository->fillTemplate(
 					$template,
 					$templateFromFile

Classes/Controller/NewsletterController.php

@@ -166,6 +166,8 @@ class NewsletterController extends AbstractController {
 					$selectedLanguage
 				);
 				$template = GeneralUtility::makeInstance(Template::class);
+				$template->setSiteLanguage($selectedLanguage);
+				$template->setPid($this->getPid());
 				$this->templateRepository->fillTemplate($template, $templateFromFile);
 			} else {
 				$template->setIsOverwritten(TRUE);