i agree. It's not a simple task however i cant explain why they didnt saw anything, this is unbelievable... if youre a modder then you'll agree that changing ids dont make armors disapear certainly a problem with armor rating for npc but your character also appears nvde when wearing dlc armor so its not only a translation problem
1: They prolly didn't thought about testing it out.
2: Actually, changing the IDs do effect it. In the older TES games, Armors uses many different IDs. The main ID is the item itself while the others are all the armor's looks. Changing the Main ID does nothing but if you change the other IDs, then the Main one will be trying to read the original but cannot for the original aren't there anymore.. Therefore, the armor will have no looks and will just, well, show whatever you have under it which in this case will be your skin only.
3: It could also be the files, not the IDs. If they accidentally renamed all the files that are the looks, so to say, then this can cause problems and make everything invisible cause the game cannot find the original files that it is suppose to be connected to..
Basicly, to fix it. Bethesda gotta go thru every single ID/File and rename them back in order to fix the looks.. And they gotta do this for all languages they have..