Workaround for rubys/feedvalidator#21 so that Travis CI tests work.

Author: jericson

test/test.rb

@@ -11,7 +11,7 @@ def setup
   end
 
   def test_valid_feed
-    system("python feedvalidator/src/demo.py https://unicorn-meta-zoo.github.io/index.rss")
+    system("LANGUAGE=en python feedvalidator/src/demo.py https://unicorn-meta-zoo.github.io/index.rss")
     assert_equal $?, 0
   end
 end