Updating Greek translation URL

https://twitter.com/savvasradevic/status/260724844801441792

22-translations.pd

@@ -89,7 +89,7 @@ Their translation is located at [http://abop-german.berlios.de](http://abop-germ
 
 ## Greek
 
-The [Greek Ubuntu Community](http://ubuntu-gr.org) translated the book in Greek, for use in our on-line asynchronous Python lessons that take place in our forums. 
+The Greek Ubuntu Community [translated the book in Greek](http://wiki.ubuntu-gr.org/byte-of-python-el), for use in our on-line asynchronous Python lessons that take place in our forums. Contact [@savvasradevic](https://twitter.com/savvasradevic) for more information.
 
 ## Indonesian