Version 2.18.2
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- Calculate correctly the maximum printed image size on 
  landscape page (Claudio Saavedra)
- Fix problem when possibly applying parallel image 
  transformations (Felix Riemann) [#416257]
- Update icon cache when uninstalling icons (Brian Pepple) [#432439]
- Code cleanups (Felix Riemann) [#433127] 
- Correctly set slideshow delay when being entered with 
  the keyboard (Ryan Cumming)
- Update README and AUTHORS files (Claudio Saavedra) [#437691]
- Fix runtime critical warnings (Claudio Saavedra) [#430021]
- Manual fixes (Felix Riemann) [#431297]
- Updated translations: Yannig Marchegay (oc), Priit Laes (et)