allow to translate image's exceprt

config/locales/server.en.yml

@@ -138,6 +138,8 @@ en:
     hot: "Hot topics"
   too_late_to_edit: "That post was created too long ago. It can no longer be edited or deleted."
 
+  excerpt_image: "image"
+
   groups:
     errors:
       can_not_modify_automatic: "You can not modify an automatic group"

lib/excerpt_parser.rb

@@ -56,7 +56,7 @@ class ExcerptParser < Nokogiri::XML::SAX::Document
         elsif attributes["title"]
           characters("[#{attributes["title"]}]")
         else
-          characters("[image]")
+          characters("[#{I18n.t 'excerpt_image'}]")
         end
 
         characters("(#{attributes['src']})") if @markdown_images