Removes static strings from the deletePage command

src/main/resources/strings.yml

@@ -9,6 +9,7 @@ en:
   SUCCESS_GIVE_SENT: "Book sent!"
   SUCCESS_GIVE_RECEIVED: "Book received!"
   SUCCESS_TITLE_PAGE_ADDED: "Title page added!"
+  SUCCESS_PAGE_DELETED: "Page deleted!"
   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!"
@@ -46,6 +47,8 @@ en:
   ERROR_GIVE_INVALID_COPIES_AMOUNT: "Invalid number of book copies specified!"
   ERROR_GIVE_LOAD_FAILED: "Book failed to load!"
   ERROR_INVALID_BOOK_PAGE: "Invalid page index given!"
+  ERROR_OUT_OF_RANGE_BOOK_PAGE: "The given page index is out of bounds!"
+  ERROR_NO_BOOK_PAGE: "You must supply a page index"
   NEUTRAL_COMMANDS_HEADER: |
     &e[] denote optional parameters
     <> denote required parameters