Version 2.17.90
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- Several code cleanups (Felix Riemann)
- Small i18n fix (Philip Kerling) [#395541]
- Updated translations: Priit Laes (et), Daniel Nylander (sv), 
  Clytie Siddall (vi), Hendrik Richter (de), Raphael Higino (pt_BR),
  Djihed Afifi (ar), Rasmus Ory Nielsen (da), Yair Hershkovitz (he),
  Theppitak Karoonboonyanan (th), Kjartan Maraas (nb), Matic Zgur (sl),
  Jakub Friedl (cs)