improve some french translations
also pair correctly the javascript exercise
I use pydev to edit python code in eclipse
well, I'm really unable to write a switch-case in python. Give up on this
that's obsolete now that the tests were converted to junit
avoid NPE to other parts of the code
complete a bit the python bindings of buggleworld
report properly compilation errors in the entities
deal properly with compilation errors in python code (fix #78)
Reduce a bit the thread madness

Instead of having Game knowning the list of threads running the exo so
that it can destroy them when the stop button is pressed, implement a
LessonRunner.stopAll() method doing the armageddon and hide the
threads to Game.