Translation updates

Changes were contributed by:
  [ca] divendres (closes #115)
  [de] LibertyMarine (closes #116)
  [es] David Vaz Guijarro (closes #113)
  [ja] Noumi Ryoko (closes #110)
  [nl] GertlilyNL (closes #112)
  [nl] Leonard Simonse (closes #112)
  [sk] pyler (closes #111)
  [zh-rCN] Yeechan Lu (closes #114)