Hi,
It was me who did the English mission translations and the ingame warnings on the Vikings.
I bought the gog game just to see if the procedure would work, and it did!
If gog get the permission from ubi, they could use my translation. ofcourse some minor issues remain, like the german title screen and german audio track. but there are also advantages, ingame warnings for low resources and traffic jams, recruit soldiers here button to collect beer and weapons in a selected storehouse with just 1 button instead of having to go to all the storehouses and regulate the flow of beer and weapons. Standard no gold to military buildings, making for better control of the gold. And 12 new single player missions with a new quest system that allows for sub quests, so it's not only get to the portal but other stuff along the way. Probably some more stuff I forgot about, all in all it's kind of an update to the game engine and some missions, so it would be nice to get.
Darkje (known as Mjorky in ubi forums)
edit:
some of the issues mentioned got fixed in the ubi forums, I translated the updated editor with random map generator, and someone provided an English title screen.
edit2: 23-feb-2013
I have now translated the entire game , even the soundtrack. I posted an updated install procedure and download in the UBI forums:
http://forums.ubi.com/showthread.php/203258-Vikings-add-on-How-to-Install-Play-on-English-Version?p=1832447&viewfull=1#post1832447