Version 2.23.1
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* Added the Optimization Guide, content by Callum McKenzie and Robert Love,
  DocBook by William Johnston
* Updated a link to the newish GIO section
* Updates to email addresses et al in the GDP Handbook
* Updates to images in the HIG
* Updated translations:
  es    (Jorge Gonzalez)
  fr    (Claude Paroz)

Version 2.22.0
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* Updated Platform Overview to reflect new GIO/GVFS stuff
* Updated translations:
  es    (Jorge Gonzalez)
  fr    (Claude Paroz)

Version 2.21.1
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* Added new images to the HIG from <ropiku@gmail.com> [#503671]
* Integrated "What's New in 2.0" from d.g.o (Calum Benson)
* Updated translations:
  es    (Jorge Gonzalez)
  ru    (Yuri Penkin)
  oc    (Yannig Marchegay)
  it    (Luca Ferretti)

Version 2.20.0
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- Added the HIG
- Added Federico's Integration Guide
- Updated translations:
  es    (Jorge Gonzalez)
  it    (Luca Ferretti)
  sv    (Daniel Nylander)

Version 2.19.1
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* First release, includes Platform Overview, GDP Style Guide, and GDP Handbook
