Those errors are fine, but you can try the following in the console:
frostwyrm.short
This should spit back the text that is being used.
frostwyrm.Internal_short
This will spit back what is actually stored.
I think somehow the Internal_short value got mangled and there's some iffy javascript type coercion going on that is fucking things up, but you should be able to fix it by doing
frostwyrm.short = "The name you want her to have"
Donkey was messing with how this was implemented a couple of months ago and did it in such a way that the value got dropped from save files, so if you saved in the window is was broken like that, it's possible it got vanished/fucked up in a weird way. These instances SHOULD be getting caught and replaced with the baseline "Frostwyrm" value, so it's making me think you're running an old version of the game from when this was broken?