Angular-gettext is available on GitHub: https://github.com/rubenv/angular-gettext.
The grunt tasks can be found at https://github.com/rubenv/grunt-angular-gettext.
Usage instructions can be found in the developer guide.
Pull requests are welcomed (if they make sense).
All code lives in the src folder and is written in JavaScript. Try to stick to the style conventions used in existing code.
Tests can be run using grunt test. A convenience command to automatically run the tests is also available: grunt watch. Please add test cases when adding new functionality: this will prove that it works and ensure that it will keep working in the future.