Fix moment.js locale for English

Kwpolska · Kwpolska · commit 41bb4b2c758c · 2015-10-01T21:05:56.000+02:00
Signed-off-by: Chris Warrick &lt;kwpolska@gmail.com&gt;
diff --git a/nikola/nikola.py b/nikola/nikola.py
@@ -221,7 +221,7 @@
         da='da',
         de='de',
         el='el',
-        en='',
+        en='en',
         eo='eo',
         es='es',
         et='et',
