Internationalization, locale and entity translation

## Ready State: Yes

* Added i18n contributed modules for internationalization, entity translation and locale.
* Added a placeholder README.md for the Documentation, pointing to the INDEX.md

## Deployment

* Rebuild (or build local Drupal contributed project instances for additions).
* Re-export any entities using Features (this will introduce default translation properties).
* Revert features
* Clear caches.