Fixed: browser's accept-language subcodes ignored (#1320).

git-svn-id: http://redmine.rubyforge.org/svn/trunk@1481 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/functional/welcome_controller_test.rb

@@ -46,4 +46,11 @@ class WelcomeControllerTest < Test::Unit::TestCase
     get :index
     assert_equal :fr, @controller.current_language
   end
+  
+  def test_browser_language_alternate
+    Setting.default_language = 'en'
+    @request.env['HTTP_ACCEPT_LANGUAGE'] = 'zh-TW'
+    get :index
+    assert_equal :"zh-tw", @controller.current_language
+  end
 end