3.17.4
======

* Improvements to the HIG (Allan Day)
* Improved  licensing of the platform overview (Ekaterina Gerasimova)
* Port Python demos to Python 3 (David King)
* Add a page on API stability to the programming guidelines (Philip Withnall)
* Updated translations:
  cs      (Marek Černocký)
  el      (Dimitris Spingos)
  es      (Daniel Mustieles)