Item Descriptions

Added

• Show translation keys debug tool will now translate keys when Alt is held.
• Additional convention tags for some modded blocks and items.
• On 1.21 and above, ability to use custom painting variant descriptions.
• On 1.21 and above, support for Polymer's custom items and blocks.
• Where possible, blocks with visible contents now show the description of the item inside, not their own descriptions.
  • This includes Item Frames.
  • This includes Fast Item Frames.
  • This includes Glowcase Item Display Entities.

Fixed

• Incorrect descriptions on leaves, swords, and axes.