item names don't appear correctly

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in the crafting table and stonecutter items come up as title.stoneslab.name ad other similar things
instead of totle.stoneslab.name i thought it should have come up like Stone Slab just like Wood Planks come up

What actually happened was...:
Describe what happened here

Steps to Reproduce:
1. I entered my world and it happened
2. ...
3. ...