The 'snow wolf' does not exist, its correct name is 'arctic wolf'. As the
only wolf with white fur, it does not live outside Canada and Greenland. I don't
object to placing it on snow, it's no less wrong than Baobabs in Turkey
(skirmish map 'Zagros Mountains (2)') or Zebras at the Caspian sea (skirmish map
'Caspian Sea (2v2)').
The PNG file contained an exif string referencing the 'snow wolf', a leftover from Photoshop.
The other changes should be straightforward.
This patch overlaps with D525, ideally those changes would be comitted first.