[nit] js: config: Set default lang to null instead of empty string
@@ -5,7 +5,7 @@ var utils = require("app/utils");
var config = {
"css": true,
"css-url": null,
- "lang": "",
+ "lang": null,
"default-lang": "en",
"reply-to-self": false,
"require-email": false,
