Fix format string.

biscuit/apps/exlibris/views.py

@@ -276,7 +276,7 @@ def person_borrow(request: HttpRequest) -> HttpResponse:
                 book_copy.borrower = person
                 book_copy.save()
 
-                messages.success(request, _('Book %s borrowed to %s.') % book_copy.book.title)
+                messages.success(request, _('Book %s borrowed to %s.') % (book_copy.book.title, person))
 
             person_borrow_form = PersonBorrowForm()