While writing the Drupal 7 multilingual features posts and planning for the upcoming items in the series, I always wanted to figure out a framework for thinking of these items and to match core features and modules with contributed module functionality. Drupal 7 clearly is a multilingual system with additional contributed modules only. Also, there are so many modules involved that a summary of which Drupal objects they work with and what functionality they serve would be clearly beneficial to summarize in an overview.