added notes about #localize optimization TODOs

lib/i18n/backend/simple.rb

@@ -47,12 +47,15 @@ def localize(locale, object, format = :default)
         raise ArgumentError, "Object must be a Date, DateTime or Time object. #{object.inspect} given." unless object.respond_to?(:strftime)
 
         type = object.respond_to?(:sec) ? 'time' : 'date'
+        # TODO only translate these if format is a String?
         formats = translate(locale, :"#{type}.formats")
         format = formats[format.to_sym] if formats && formats[format.to_sym]
         # TODO raise exception unless format found?
         format = format.to_s.dup
 
-        format.gsub!(/%a/, translate(locale, :"date.abbr_day_names")[object.wday])
+        # TODO only translate these if the format string is actually present
+        # TODO check which format strings are present, then bulk translate then, then replace them
+        format.gsub!(/%a/, translate(locale, :"date.abbr_day_names")[object.wday]) 
         format.gsub!(/%A/, translate(locale, :"date.day_names")[object.wday])
         format.gsub!(/%b/, translate(locale, :"date.abbr_month_names")[object.mon])
         format.gsub!(/%B/, translate(locale, :"date.month_names")[object.mon])