also translate 'No file was uploaded. Unknown error'

apps/files/ajax/upload.php

@@ -8,14 +8,14 @@ OCP\JSON::setContentTypeHeader('text/plain');
 
 OCP\JSON::checkLoggedIn();
 OCP\JSON::callCheck();
+$l=OC_L10N::get('files');
 
 if (!isset($_FILES['files'])) {
-	OCP\JSON::error(array('data' => array( 'message' => 'No file was uploaded. Unknown error' )));
+	OCP\JSON::error(array('data' => array( 'message' => $l->t( 'No file was uploaded. Unknown error' ))));
 	exit();
 }
 foreach ($_FILES['files']['error'] as $error) {
 	if ($error != 0) {
-		$l=OC_L10N::get('files');
 		$errors = array(
 			UPLOAD_ERR_OK=>$l->t('There is no error, the file uploaded with success'),
 			UPLOAD_ERR_INI_SIZE=>$l->t('The uploaded file exceeds the upload_max_filesize directive in php.ini: ')