[TASK] Setting correct language for formhandler mails

Classes/Service/FormhandlerFinisherService.php

@@ -67,8 +67,10 @@ class FormhandlerFinisherService extends AbstractFinisher {
 			$toAddress = $this->gp['email'];
 		}
 
+		$language = $GLOBALS['TSFE']->config['config']['language'];
+
 		MailTemplateService::sendEmail(
-			'en', $this->settings['template_key'], $this->settings['extension_key'], $toAddress,
+			$language, $this->settings['template_key'], $this->settings['extension_key'], $toAddress,
 			$this->settings['from_address'], $subject, $this->gp, $this->settings['ignore_mail_queue']
 		);
 		return $this->gp;