Files: rename 'space' to 'storage' in upload.php

apps/files/ajax/upload.php

@@ -49,7 +49,7 @@ foreach ($files['size'] as $size) {
 	$totalSize += $size;
 }
 if ($totalSize > \OC\Files\Filesystem::free_space($dir)) {
-	OCP\JSON::error(array('data' => array('message' => $l->t('Not enough space available'),
+	OCP\JSON::error(array('data' => array('message' => $l->t('Not enough storage available'),
 		'uploadMaxFilesize' => $maxUploadFilesize,
 		'maxHumanFilesize' => $maxHumanFilesize)));
 	exit();