Release 2.4.11

Git and TurtleWorld's equality should both be working now :)

• Improved translations:
  • Brazilian Portuguese: Missions at 54% despite content changes
• Engine:
  • #224: If the execution is interrupted, the exercise is failed
  • #380: Disable creative mode when switching the exercise
  • Lessons: Prevent users from accessing broken lessons and add tests
    to detect them.
  • GitSpy: Fix a bug which overwrote the current exercise's files
    for the current programming language by the current exercise's files
    for the last result's programming language
  • Git: Refactor Git related code to fix progression loss bugs
• Worlds:
  • Turtle: equal() was not detecting when lines are overlapping
    with no common extremities. We now detect when one line is
    strictly included within another one, but not when they are
    intermixed (yet). Fix #381.
• Pedagogical content:
  • #378, #393: French typo
  • #383: Fix the name of the Scala entity
  • #387: Fix a broken link when run from the jar
  • #388: The Pancake #0 is actually on top (fix mission text)