[BUGFIX] Fix some final issues

Classes/Controller/MailController.php

@@ -253,7 +253,7 @@ class MailController extends ActionController {
 		$mailTemplateService->setFromAddress('noreply@example.org');
 		$mailTemplateService->setTemplateName($selectedTemplateKey);
 		$mailTemplateService->setExtensionKey($selectedExtensionKey);
-		$mailIsSend = $mailTemplateService->sendEmail($this->settings['mail']['test']['subject'], TRUE);
+		$mailIsSend = $mailTemplateService->sendEmail(TRUE);
 
 		if ($selectedLanguageRight !== $selectedLanguageLeft) {
 			/** @var \SGalinski\SgMail\Service\MailTemplateService $mailTemplateService */
@@ -263,7 +263,7 @@ class MailController extends ActionController {
 			$mailTemplateService->setFromAddress('noreply@example.org');
 			$mailTemplateService->setTemplateName($selectedTemplateKey);
 			$mailTemplateService->setExtensionKey($selectedExtensionKey);
-			$mailIsSend = $mailTemplateService->sendEmail($this->settings['mail']['test']['subject'], TRUE);
+			$mailIsSend = $mailTemplateService->sendEmail(TRUE);
 		}
 
 		if ($mailIsSend) {

Classes/Service/MailTemplateService.php

@@ -168,6 +168,7 @@ class MailTemplateService {
 	 * @param string $templatePath
 	 * @param string $description
 	 * @param array $markers
+	 * @param array $subjects
 	 */
 	public static function registerTemplate(
 		$extension, $templateName, $templatePath, $description, array $markers, array $subjects
@@ -194,15 +195,14 @@ class MailTemplateService {
 	/**
 	 * Send the Email
 	 *
-	 * @param string $subject
 	 * @param boolean $isPreview
 	 * @return boolean email was sent or added to mail queue successfully?
 	 */
-	public function sendEmail($subject = '', $isPreview = FALSE) {
+	public function sendEmail($isPreview = FALSE) {
 		/** @var Template $template */
-		$template = $this->templateRepository->findTemplate(
+		$template = $this->templateRepository->findOneByTemplate(
 			$this->extensionKey, $this->templateName, $this->language
-		)->getFirst();
+		);
 
 		// If there is no template for this language, use the default template
 		if ($template === NULL) {