update docs

CHANGELOG.md

@@ -6,6 +6,9 @@ Contributors: please follow the recommendations outlined at [keepachangelog.com]
 ## [Unreleased]
 *Please add entries here for your pull requests.*
 
+### Added
+- Allow using rake task to generate javascript locale files. [#717](https://github.com/shakacode/react_on_rails/pull/717) by [JasonYCHuang](https://github.com/JasonYCHuang).
+
 ## [6.6.0] - 2017-02-18
 ### Added
 - Switched to yarn! [#715](https://github.com/shakacode/react_on_rails/pull/715) by [squadette](https://github.com/squadette).

docs/basics/i18n.md

@@ -44,17 +44,15 @@ You can refer to [react-webpack-rails-tutorial](https://github.com/shakacode/rea
   config.i18n_dir = Rails.root.join("PATH_TO", "YOUR_JS_I18N_FOLDER")
   ```
 
-  Add following lines to `config/application.rb`, this will help you to generate `translations.js` & `default.js` automatically when you starts the server.
+4. Javascript locale files must be generated before `npm build`. 
+  
+  For __production__ and __test__, once you setup `config.i18n_dir` as in the previous step, react_on_rails will help you to do this.
 
-  ```js
-  module YourModule
-    class Application < Rails::Application
-      ...
-      config.after_initialize do
-        ReactOnRails::LocalesToJs.new
-      end
-    end
-  end
+
+  For __dev__ , add `bundle exec rake react_on_rails:locale` to `Procfile.dev` before `npm build`.
+
+  ```ruby
+  client: sh -c 'rm app/assets/webpack/* || true && bundle exec rake react_on_rails:locale && cd client && npm run build:development'
   ```
 
 5. In React, you need to initialize `react-intl`, and set parameters for it.