[TASK] Add all fields when creating templates manually

Classes/Service/RegisterService.php

@@ -248,7 +248,8 @@ class RegisterService implements \TYPO3\CMS\Core\SingletonInterface {
 			'template_key' => $templateKey,
 			'description' => $description,
 			'subject' => $subject,
-			'markers' => []
+			'markers' => [],
+			'templateContent' => '{all_fields}'
 		];
 
 		foreach ($markers as $marker) {