tModLoader how do you add a flavor text for an item?

I was making a texture pack and wanted to make the copper short swords' flavor text "looks much more threatening than it should"
but when made a flavor text for it. it didn't appear. even after i properly followed the needed text in the .json file, so please could anyone help me.
 
I don't think you can do that with just a resource pack. You can with a mod, however.
 
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