It's a nice start, but I have some suggestions to make it even easier:

  1. Automatically create a multilanguage version from a normal app.
  2. Provide a tool to edit or at least export to .resjson

Regarding 1:

in a HTML file you have:

<p>Hello World</p>

The tool should:

  1. collect all strings
  2. create a "en-US" folder (or other default language), put in the resources.resjson like so:
    {
      "string1" : "Hello World",
      "_string1.source" : "Hello World",       // optional?
      "_string1.comment" : "commentstring1"
    }
  3. manipulate the HTML to this (optional, some do it in JS):
    <p data-win-res="{textContent: 'string1'}">Hello World</p>

 

This would be a great tool!