I18N Code Work done.

lib/books.py

@@ -3,6 +3,7 @@ import os
 import xml.dom.minidom
 from typing import Dict, List, cast
 
+from PyQt6.QtCore import QCoreApplication
 from PyQt6.QtSql import QSqlQuery
 
 from main import query_error
@@ -20,13 +21,16 @@ class Book:
         return
 
     def load(self, book_id: int) -> None:
+        translate = QCoreApplication.translate
         query = QSqlQuery()
         query.prepare("SELECT * FROM books where book_id = :book_id")
         query.bindValue(":book_id", book_id)
         if not query.exec():
             query_error(query)
         if not query.next():
-            raise Exception(f"Missing book? book_id={book_id}")
+            raise Exception(
+                translate("Book", "Missing book? book_id=") + f"{book_id}"
+            )
         self.metadata = {
             "title": query.value("title"),
             "creator": query.value("author"),