Support missing translations for i18n 1.14

missing translation: changed to Missing translation in the source
Changed our dictionary to handle this case

Author: kbrock

app/models/dictionary.rb

@@ -52,7 +52,7 @@ def self.ui_lookup(options = {})
 
   def self.i18n_lookup(type, text)
     result = I18n.t("dictionary.#{type}.#{text}", :locale => "en")
-    result.start_with?("translation missing:") ? nil : result
+    result.start_with?("Translation missing:") ? nil : result
   end
   private_class_method :i18n_lookup
 end