[PIDR] First Pull

Content:
* Full basic translation of the JLM in French ( using po4a )
* Correction of the Sorting World
* Correction of the demo from "IslandMaze" and "PledgeAlgorithm" in the "Exit the maze algorithm" activity
* Add a map to each exercise who had only one map in "Exit the maze algorithm" activity 
* Add the world corresponding to the baseball & pancake activities for the SMN
* Integration of the "LessonNavigator" realized by Marion LEBRAS
* Correction of several typos in English/HTML