GCompris : I got IT Files

Bug fixes:

- windows installer: fixed a potential directory erasing at uninstall
  or reinstall time. Properly erase all our files at unistallation
  time

- windows: updated the compilation chain for windows to compile
  against GTK 2.24

- desktop entry: Added the Education category

- compilation: Added ifdefs to compile with gdkpixbuf > 2.24 by Hans
  de Goede

- guessnumber: fixed a potential crash at exit time. Give focus on the
  entry box.

- braille fun: added audio feedback.

- braille alphabet: improved to audio play the letter to find

- braille lotto: fixed not to go back to the main menu at the
  end. Improved it a little bit the layour to accomodate with longer
  translated text. Added sound effects.

- shapegame: Fixed a random crash in shapegame activities that
  happened while dragging a piece. Minor, now clicking on the
  left/right image selector does not trig the ok check.

- findit: Fixed to run on Windows 7

- clockgame: the first levels now highlight the hour sectors to make
  them easier to recognize and to teach. (By Angelo Naselli)

- instruments activity: added a check for sound availability in the
  icon menu. Now the background music is muted when
  entering this activity.

- memory: minor fix in memory activity to fix their reference to their
  mandatory audio file.  Without this, a little audio error does
  appear at run time in the activity icon.

Translations updates

- Updated Estonian translation by Olle Niit
- Updated Serbian translation by Мирослав Николић