Cleans up the decrypt command somewhat

src/main/resources/strings.yml

@@ -2,6 +2,8 @@ en:
   PREFIX: "[BwB]"
   SUCCESS_COPY: "Book copied!"
   SUCCESS_CLEARED: "Book cleared!"
+  SUCCESS_DECRYPTED: "Book decrypted!"
+  SUCCESS_AUTO_DECRYPTED: "Book auto-decrypted!"
   ERROR_PLAYER_ONLY: "This command can only be used by a player!"
   ERROR_NOT_HOLDING_WRITTEN_BOOK: "You must be holding a written book to {action} it!"
   ERROR_NOT_HOLDING_WRITABLE_BOOK: "You must be holding a writable book to {action} it!"
@@ -15,6 +17,10 @@ en:
   ERROR_INVENTORY_FULL: "You need an available slot in your inventory."
   ERROR_METADATA_MISSING: "Unable to get metadata for the held book!"
   ERROR_VAULT_COST_BUT_UNAVAILABLE: "&4The cost was set to economy, but Vault is unavailable!"
+  ERROR_DECRYPT_MISSING_KEY: "No decryption password given!"
+  ERROR_DECRYPT_FAILED: "Failed to decrypt book!"
+  ERROR_ENCRYPTED_DIRECTORY_EMPTY_OR_MISSING: "Could not find any encrypted files!"
+  ERROR_ENCRYPTED_BOOK_UNKNOWN: "No matching encrypted book found!"
   NEUTRAL_COMMANDS_HEADER: |
     &e[] denote optional parameters
     <> denote required parameters