diff -Naur calibre.orig/calibre/gui2/library/models.py calibre/calibre/gui2/library/models.py
--- calibre.orig/calibre/gui2/library/models.py	2012-01-20 15:07:19.000000000 +0530
+++ calibre/calibre/gui2/library/models.py	2012-01-24 11:41:27.438700899 +0530
@@ -7,6 +7,7 @@
 
 import functools, re, os, traceback, errno
 from collections import defaultdict
+from gettext import ngettext
 
 from PyQt4.Qt import (QAbstractTableModel, Qt, pyqtSignal, QIcon, QImage,
         QModelIndex, QVariant, QDateTime, QColor)
diff -Naur calibre.orig/calibre/library/field_metadata.py calibre/calibre/library/field_metadata.py
--- calibre.orig/calibre/library/field_metadata.py	2012-01-20 15:07:19.000000000 +0530
+++ calibre/calibre/library/field_metadata.py	2012-01-24 11:41:17.262089365 +0530
@@ -5,6 +5,7 @@
 '''
 import copy, traceback
 from collections import OrderedDict
+from gettext import ngettext
 
 from calibre.utils.config import tweaks