More Chiseled Bookshelf Variants

1.6.0:

• Internal code changes to facilitate 1.21.1 version
• (1.21.1) Release

1.5.5:

• Add missing Oak Chiseled Bookshelf recipe

1.5.4:

• Correctly apply Oak prefix to the vanilla Chiseled Bookshelf
• Fix British spellings (en_gb)