Version 2.17.2
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- Manual translations fixes (Claudio Saavedra, Felix Riemman) 
  [#363348, #366695]
- Several code cleanups (Claudio Saavedra, Felix Riemann) [#375897]
- Use stock icons for rotate and flip actions (Luca Ferretti) [#305823]
- Migration to GtkPrint (Claudio Saavedra)
- Make check pattern for transparent images a bit lighter (Claudio Saavedra)
  [#350183] 
- i18n fixes on save as dialog for multiple images (Felix Riemman) 
  [#337642, #340490] 
- Build infrastructre fixes (Felix Riemann) [#372820]
- Updated manual translations: Daniel Nylander (sv), Francisco Javier
  F. Serrador (es) 
- Updated translations: Satoru Satoh (ja), Hendrik Richter (de),
  Danilo Nylander (sv), Jakub Friedl (cs)