Yep, we did that change to the editor to fix some other problems. I'm not sure it's worth backporting at this time - Maybe an automated note on the maps downloads, like we have for maps that require > Build 18 and for maps with more than 8 players?
Yes, maybe. It could also be good to change default tribe "random" in the editor back to something like "barbarians"?
AFAIK the tribes are only important for scenario maps, which are rather rare.
By the way, I found a typo in the German description of the map "Crater". ( "... imm Krater ... ")