Speed up I18n helpers in views and add entry to CHANGELOG.

actionpack/lib/action_view/helpers/translation_helper.rb

@@ -20,7 +20,7 @@ module ActionView
         options[:raise] = true
         translation = I18n.translate(scope_key_by_partial(key), options)
         translation = (translation.respond_to?(:join) ? translation.join : translation)
-        if html_safe_translation_key? key
+        if html_safe_translation_key?(key)
           translation.html_safe
         else
           translation
@@ -53,12 +53,8 @@ module ActionView
         end
 
         def html_safe_translation_key?(key)
-          last_key = if key.is_a? Array
-            key.last
-          else
-            key.to_s.split('.').last
-          end
-          (last_key == "html") || (last_key.ends_with? "_html")
+          key = key.is_a?(Array) ? key.last : key.to_s
+          key =~ /(\b|_|\.)html$/
         end
     end
   end

activesupport/CHANGELOG

@@ -1,5 +1,7 @@
 *Rails 3.0.0 [beta 4/release candidate] (unreleased)*
 
+* Deprecate {{}} as interpolation syntax for I18n in favor of %{} [José Valim]
+
 * Array#to_xml is more powerful and able to handle the same types as Hash#to_xml #4490 [Neeraj Singh]
 
 * Harmonize the caching API and refactor the backends.  #4452 [Brian Durand]