This mod simply renames the dead butterflies and puts the "dead" at the end, so you don't have to always skip the first word when you read the names while you sort through your butterfly collection.

Dead Butterfly    ⇒    Butterfly, dead

This mod is only for the English version, but if you want to rename the butterflies in a different language, just find the right line in the language json (Vintagestory → assets → game → lang → *.json) and change it accordingly.

In en.json it is:

"item-deadbutterfly": "Dead {0}",

And in the mod:

"game:item-deadbutterfly": "{0}, dead"

That's all.