* Update readme on internationalization
* Run compilemessages when building production image
* Run compilemessages when deploying to Heroku
* Always keep Heroku post-compile hooks
* Add empty po file for en-US language
* Update instructions for Docker
* Update default po file
* Convert locale readme to markdown and expand a bit the instructions
* Don't compile translations for 3rd party packages
* Use simplified settings & set env variables for compiling translations
* Update README for translations
* Improve metadata for Brazilian Portuguese translations
* Fix condition for django compressor on Heroku
* Fix condition for Django Compressor
