refresh a bit the french translations
Release 2.3:

  * LectureChooser: fix preferred size to the MainFrame one (fix #118)
  * AboutDialog: display the license and ChangeLog too
  * TurtleWorld: better error message when the amount of lines differs
  * TurtleWorld: new builtins to hide()/show() the turtle.
  * PancakeWorld: The larger pancake is getStackSize()-1
  * PancakeWorld: avoid ../ in the icon path: doesn't work in jarfiles
  * recursion.DragonCurve1: slight mission text improvement
  * recursion.SquareKoch: new exercise (variation over the Koch idea)
  * recursion.PentaKoch: new exercise (another variation of Koch curve)
  * recursion.HexaKoch: new exercise (yet another Koch curve)
  * recursion.Crab: new exercise (another L-system: the Lévy C curve)
  * sort.dutchflag: mention about the existing colors in the doc
  * sort.dutchflag: allow to play with the mouse through drag and drop
  * recursion.hanoi: builtin getRadius(slot): radius of top-most disk
  * recursion.hanoi: allow to play with the mouse through drag and drop
  * MainFrame: Implement a "Save a picture" feature, useful in turtleart
  * welcome.MethodsArgs.py: compare directions without relying on
    their name to avoid l10n issues (fix #122)
  * As usual, fix some typos in the French translation