3.3.1
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* Platform Overview
- Fixed link in ATK documentation (Joanmarie Diggs)
- Added previously omitted files to Makefile.am (Tiffany Antopolski)
- Updated translations:
  es (Daniel Mustieles)
  ja (Jiro Matsuzawa, Okano Takayoshi)

* Platform Demos
- Added previously omitted files to Makefile.am (Tiffany Antopolski)
- Added Vala version of Image Viewer Demo (P.F. Chimento)
- Updated translations:
  ca (Sergi Morraja, Gil Forcada)
  el (Simon Xenitellis, Chris Triantafillis)
  es (Daniel Mustieles)
  fr (Bruno Brouard)

* Integration Guide
- Updated translation:
  gl (Fran DiĆ©guez)

* Human Interface Guidelines
 - Updated translation:
 es (Daniel Musteles)

* Accessibility Development Guide
 - Updated translations:
 ja (Jiro Matsuzawa)
 es (Daniel Mustieles)