It was actually something completely else than I thought. Nothing to do with the models. Small letters in place where should have been capitals letters, while I used to correct ones in about 30 other remaining lines with valenwood in the file.
The file is defining how is everything called in game.
The wrong one "{EMT_Valenwood_FORT}Bosmeri Fort"
Correct one "{EMT_VALENWOOD_FORT}Bosmeri Fort"
We are fortunate, as this file does not affect compatibility, so we can roll on.
Only thing you need to do is download updated
expanded.txt, and use it to replace the original file in The_Elder_Scrolls/data/text. And delete bin file with same name (new one will be created once the game is launched). Or you can change the letter yourself I suppose