[TASK] Removing default value from parameter

Classes/Service/MailTemplateService.php

@@ -95,9 +95,12 @@ class MailTemplateService {
 	 */
 	public static function sendEmail(
 		$language, $templateKey, $extensionKey, $toAddress, array $fromAddress, $subject,
-		array $content = [],
+		array $content,
 		$ignoreMailQueue = FALSE
 	) {
+		// @TODO get language dynamically
+		!isset($language) ? $language = 'de' : null;
+
 		// Set Email Content
 		$registerArray = MailTemplateService::getRegisterArray();
 		$templateEntry = $registerArray[$extensionKey][$templateKey];