I found a Nisfit's riveted plate helmet in a dungeon. Unfortunately, where it should be in my inventory is a box with an X in it with the quantity 1 unit (see attached screenshot). It also doesn't appear in my list of available armor when I go to army members and try to switch out armor.
If it's the apostrophe causing all these problems with this particular item, I think we'd be okay with one item with a grammatically incorrect name if you wanted to remove the apostrophe.