tx2manifest is a utility to help in i18n of FirefoxOS apps which adhere to the design pattern described in this article. The goals of the project are modest: implement something useful to me as a FirefoxOS developer while exploring node.js, Promises and q-io (which are amazing tools by the way).
As root, type
npm install -g tx2manifest
In the root directory of your app, type:
tx2manifest -h # To get usage tx2manifest # If the default options suit you
The command does not modify any files, it simply prints the updated manifest to the console.