Feature request

Feature description
Add the shorter term for "turtlehelmet" named "turtlehelm" like you did with every other helmet, so I'd be able to do /i turtlehelm. It's very useful, not very important. But, I'd find it useful.

How the feature is useful
It shortens having to type out the entire "turtlehelmet" out. And, it let's you stay on track with the way you have been doing it for Essentials for other helmets & armor pieces..

Good news! In the custom_items.yml file in your Essentials folder, you can define aliases of your items, in this case, turtlehelm instead of turtlehelmet.

Example:

aliases:
  turtlehelm: turtlehelmet

Or whatever you wanna put there.

Hope this helps!