Disable Fast Scroll in modules list

Upon attempting to fast scroll, the scroller disappears, this is probably because fast scroll categories haven't been implemented.

The fast scroll scroller also prevents the CheckBox from being easily clicked. Best to disable this for now.
Add refresh button to DownloadDetailsActivity
jar v52
Translation updates

Changes were contributed by:
  [de] rovo89
  [fr] tonymanou (closes #151)
  [hu] Adam77Root (closes #157)
  [it] Vincenzo Cerminara (closes #160)
  [iw] DubelBoom (closes #155)
  [ja] Noumi Ryoko (closes #147)
  [ko] marbulas (closes #150)
  [nl] martin coulon (closes #149, closes 159)
  [ro] razorsbk (closes #152)
  [ru] gaich (closes #148)
  [sk] pyler (closes #153)
  [tr] thenorth (closes #156)
  [zh-rCN] Yeechan Lu (closes #146, closes #158)
Bump version to 2.6 beta1