l10n: Add word user in FederatedShareProvider.php

Standardizing text strings with other Nextcloud applications.

apps/federatedfilesharing/lib/FederatedShareProvider.php

@@ -190,7 +190,7 @@ public function create(IShare $share) {
 		$alreadySharedGroup = $this->getSharedWith($shareWith, IShare::TYPE_REMOTE_GROUP, $share->getNode(), 1, 0);
 		if (!empty($alreadyShared) || !empty($alreadySharedGroup)) {
 			$message = 'Sharing %1$s failed, because this item is already shared with %2$s';
-			$message_t = $this->l->t('Sharing %1$s failed, because this item is already shared with %2$s', [$share->getNode()->getName(), $shareWith]);
+			$message_t = $this->l->t('Sharing %1$s failed, because this item is already shared with user %2$s', [$share->getNode()->getName(), $shareWith]);
 			$this->logger->debug(sprintf($message, $share->getNode()->getName(), $shareWith), ['app' => 'Federated File Sharing']);
 			throw new \Exception($message_t);
 		}