add space to nls/string.js

add space to nls/string.js

Author: yodfz

src/nls/strings.js

@@ -48,6 +48,6 @@ define(function (require, exports, module) {
         "tr": true,
         "ru": true,
         "sv": true,
-        "zh-cn":true
+        "zh-cn": true
     };
 });