--- liblognorm.orig/doc/conf.py
+++ liblognorm/doc/conf.py
@@ -56,7 +56,7 @@ release = '1.1.2'

 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
-language = None
+language = 'en'

 # There are two options for replacing |today|: either, you set today to some
 # non-false value, then it is used: