fixes welcome controller test by defining available languages to include tested ones

test/functional/welcome_controller_test.rb

@@ -18,12 +18,15 @@ require 'welcome_controller'
 class WelcomeController; def rescue_action(e) raise e end; end
 
 class WelcomeControllerTest < ActionController::TestCase
-  fixtures :projects, :news
+  fixtures :projects,
+           :news,
+           :users
 
   def setup
     @controller = WelcomeController.new
     @request    = ActionController::TestRequest.new
     @response   = ActionController::TestResponse.new
+    Setting.available_languages = [:en, :fr, :"zh-TW"]
     User.current = nil
   end