Adjust notifier to Nextcloud 17

Signed-off-by: Joas Schilling <coding@schilljs.com>

lib/Notification/Notifier.php

@@ -57,6 +57,26 @@ class Notifier implements INotifier {
 		$this->boardMapper = $boardMapper;
 	}
 
+	/**
+	 * Identifier of the notifier, only use [a-z0-9_]
+	 *
+	 * @return string
+	 * @since 17.0.0
+	 */
+	public function getID(): string {
+		return 'deck';
+	}
+
+	/**
+	 * Human readable name describing the notifier
+	 *
+	 * @return string
+	 * @since 17.0.0
+	 */
+	public function getName(): string {
+		return $this->l10nFactory->get('deck')->t('Deck');
+	}
+
 	/**
 	 * @param INotification $notification
 	 * @param string $languageCode The code of the language that should be used to prepare the notification
@@ -64,7 +84,7 @@ class Notifier implements INotifier {
 	 * @throws \InvalidArgumentException When the notification was not prepared by a notifier
 	 * @since 9.0.0
 	 */
-	public function prepare(INotification $notification, $languageCode) {
+	public function prepare(INotification $notification, string $languageCode): INotification {
 		$l = $this->l10nFactory->get('deck', $languageCode);
 		if ($notification->getApp() !== 'deck') {
 			throw new \InvalidArgumentException();