also test for zh-tw sites

Author: yorkxin

spec/site_syntax_spec.rb

@@ -12,7 +12,7 @@ def app
     @app ||= InstallFest.new
   end
 
-  ['en', 'es'].each do |locale|
+  ['en', 'es', 'zh-tw'].each do |locale|
     describe "in locale '#{locale}'" do
       Site.all(locale).each do |site|
         describe "#{site.name} pages..." do