[TASK] Setting Default Language for E-Mail

Classes/Service/MailTemplateService.php

@@ -106,7 +106,7 @@ class MailTemplateService {
 	 * @param boolean $ignoreMailQueue
 	 */
 	public static function sendEmail(
-		$language, $templateKey, $extensionKey, $toAddress, $fromAddress, $subject, array $content = [],
+		$language = 'en', $templateKey, $extensionKey, $toAddress, $fromAddress, $subject, array $content = [],
 		$ignoreMailQueue = FALSE
 	) {
 		// Set Email Content