[kde-edu]: icons update

[Anne-Marie Mahfouf]

Hi David,

I am not sure if I can commit the KLettres icon now that we are in freeze. But 
if you think it's better than the current one, I'll use it (as you are the 
artist afterall ;-) so if you can join the source, thanks. I'll commit as 
soon as I have permissions.

The KBruch one is not too good in my opinion and our turtle in KTurtle could 
do with a svg bursh! So if you have some spare time...

Thanks for your great work.
I make sure that your name is added in the credits for your artwork, cheers,

Annma