Indicate installation status in version list

See #161
Reload download details on module update
Less transparency for the logo

There were some complaints that the logo is too transparent, making it
hard to see on gray backgrounds and in the recent tasks list.

So let's fill the transparent parts. No visible change for dark
backgrounds, slightly less elegant (but still ok) for white background and
much better for gray background.
jar v54
Translation updates

Changes were contributed by:
  [el] Theodore Keloglou (closes #162)
  [fr] Micks29 (closes #166)
  [ms] Jay3Belas (closes #168, closes #173)
  [pt-rBR] Marcio Zomb13 (closes #171)
  [ru] gaich (closes #163, closes #167)
  [sk] pyler (closes #164)
Bump version to 2.6