The diamond chest plate is displaying a curse enchantment in the wrong language, I created this bug report before but it was dismissed as an invalid. it is CLEARLY a bug. This is nothing to do with a community suggestion on the languange project thing, The language selected is British English, you can tell by the way "Armour" is spelled.
I believe that a mod named Mustek made a big mistake by dismissing this as invalid when it is obviously a bug that a sentence from a completely different language is being used in British English.
The response from Mustek seemed rather effortless, dare I say completely automated. I apologize for complaining about a mod here but I don't know where the appropriate place is to do so.
I have done a little bit of research and I think it might be Russian. What is a Russian sentence doing in British English? Come on Mustek, this clearly is a bug.
Will be fixed when the language strings are updated. Not a bug with the game itself.