diff -r abc91688fa2c -r 512f883c234c mercurial/help.py
--- a/mercurial/help.py	Mon Jan 04 21:54:46 2016 -0800
+++ b/mercurial/help.py	Thu Dec 17 10:30:17 2015 +0000
@@ -149,8 +149,7 @@
     for name, docs in itertools.chain(
         extensions.enabled(False).iteritems(),
         extensions.disabled().iteritems()):
-        # extensions.load ignores the UI argument
-        mod = extensions.load(None, name, '')
+        mod = extensions.load(ui, name, '')
         name = name.rpartition('.')[-1]
         if lowercontains(name) or lowercontains(docs):
             # extension docs are already translated