diff --git a/lang.py b/lang.py
index 5afc87f9a..620662fed 100644
--- a/lang.py
+++ b/lang.py
@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 import os
 import glob
 
@@ -17,13 +18,14 @@ def main():
   cn = get_lang('cn')
   for fn in glob.glob('./src/lang/*'):
     lang = os.path.basename(fn)[:-3]
-    if lang == 'cn': continue
+    if lang in ['en', 'cn']: continue
     not_transated = (set(cn.keys()) - set(get_lang(lang).keys()))
-    extra = '\n'.join(map(lambda x: '        ("%s", ""),'%x, not_transated))
-    endstr = '].iter().cloned().collect();'
-    text = open(fn).read().replace(endstr, extra + '\n' + endstr)
-    with open(fn, 'wt') as fh:
-      fh.write(text)
+    if not_transated:
+      extra = '\n'.join(map(lambda x: '        ("%s", ""),'%x, not_transated))
+      endstr = '].iter().cloned().collect();'
+      text = open(fn).read().replace(endstr, extra + '\n' + endstr)
+      with open(fn, 'wt') as fh:
+        fh.write(text)
 
 
 main()