From 46c0a9c6b6d4515bf9ff7df3c4064fd11c175446 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Thu, 9 Oct 2014 00:50:02 +0530
Subject: [PATCH] E-book viewer: When looking up words in the dictionary for a
 book that has no language set, use the English dictionary

---
 src/calibre/gui2/viewer/main.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/calibre/gui2/viewer/main.py b/src/calibre/gui2/viewer/main.py
index c5f28ddcab..b5d1551b70 100644
--- a/src/calibre/gui2/viewer/main.py
+++ b/src/calibre/gui2/viewer/main.py
@@ -53,13 +53,15 @@ class RecentAction(QAction):
 
 def default_lookup_website(lang):
     lang = lang_as_iso639_1(lang) or lang
-    if lang == 'en':
+    if lang in ('und', 'en'):
         prefix = 'https://www.wordnik.com/words/'
     else:
         prefix = 'http://%s.wiktionary.org/wiki/' % lang
     return prefix + '{word}'
 
 def lookup_website(lang):
+    if lang == 'und':
+        lang = 'en'
     wm = dprefs['word_lookups']
     return wm.get(lang, default_lookup_website(lang))