Changes some static classes into instantiated classes

src/main/resources/strings.yml

@@ -14,6 +14,7 @@ en:
   ERROR_BOOK_COPIED_TOO_FAR: "You cannot copy this book any further. You must have the original or a direct copy."
   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: "The cost was set to economy, but Vault is unavailable!"
   NEUTRAL_COMMANDS_HEADER: |
     &e[] denote optional parameters
     <> denote required parameters
@@ -26,5 +27,7 @@ en:
   NEUTRAL_COMMANDS_COMMAND: "\n \n&e{usage}: &a{description}"
   NEUTRAL_COMMANDS_COMMAND_NO_PERMISSION_REQUIRED: "None"
   NEUTRAL_COMMANDS_COMMAND_PERMISSION: " &7{{permission}}"
+  NEUTRAL_UNKNOWN_AUTHOR: "Unknown"
   ACTION_COPY: "copy"
-  ACTION_CLEAR: "clear"
+  ACTION_CLEAR: "clear"
+  ACTION_DECRYPT: "decrypt"