resync the engine's translation. No real change
Release 2.4
  Let's get ready for the Big Show of this year.

  * Improved translations:
    - Brazilian Portuguese: Missions at 39% despite content changes
    - French: Engine and Missions translation back to 100%
  * User Interface:
    - Switch from the now unmaintained jsyntaxpane to RSyntaxpaneArea
      (fix #191).
    - Switching users now works without restarting anything (fix #189)
    - Kill the cloud session export feature: git superseeds that.
    - Allow the students to provide imediate feedback on the exercises
      they just passed.
    - Restore the feature where the students can ask for the help of
      their teacher, once they have registered their identity to the
      PLM-server. Also, the PLM-server now gives a much better
      interface for the teacher.
  * Pedagogical content:
    - welcome: move the BDR after the races so that students know
      about variables when attempting them (fix #106).
  * Internal organization:
    - Move the logic related to a given programming language to a
      central class. This should make it easier to add new languages.