Display item names when trying to buy an item
I think displaying the CUSTOM name of the ítem in the text you receive when you left click the shop (trying to buy) may be a good idea, this might help those custom servers with weapons and stuff, to prevent scams like players selling a normal diamond sword instead of a custom enchanted diamond sword
You may want to improve your suggestion by providing screenshots and a more detailed explanation.
Hi Kai, I think what Voiddar is pointing out also covers this scenario too where we have new blocks in 1.12, but the description isn't helpful to the players:
I started adding the Concrete blocks in 1.12, but instead of showing Yellow Concrete or Yellow Concrete Powder, we see Concrete:4 and Concrete:7 which to players they won't know which one is which.
Since the sign can't fit it all, it should be displayed in full on the chat window.

Yeah in that case you'll have to edit the config file and set the names manually.
https://github.com/KaiKikuchi/QuickShop/blob/master/src/main/resources/config.yml#L101-L102
Example:
- CONCRETE*4;DarkRedConcrete;Dark Red Concrete