Make sure en is the current locale when running the test (#7266).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4677 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/unit/helpers/application_helper_test.rb

@@ -610,6 +610,7 @@ EXPECTED
                 Date.today - 100 => 'about 3 months late',
                 Date.today - 20000 => 'over 54 years late',
                }
+    ::I18n.locale = :en
     to_test.each do |date, expected|
       assert_equal expected, due_date_distance_in_words(date)
     end