By default this will extract content bundles from your application's locales/{country}/{language}/ directories and build .build/{locale}/_languagepack.js files, which can be loaded on a page and require()ed by browserified Javascript.
The task name it exports is makara-browserify. To use it, in your Gruntfile.js, add:
grunt.loadNpmTasks('grunt-makara-browserify');
grunt.registerTask('i18n', [ 'makara-browserify' ]);
This forms the basis of a browserify-friendly application's localization, allowing dust templates to be localized using dust-usecontent-helper and either dust-message-helper or dust-intl, or with similar techniques for React using react-intl or handlebars with handlebars-intl