Merge pull request #10220 from vipulnsward/interpolate_on_string

interpolate instead of string concat

activesupport/lib/active_support/core_ext/string/filters.rb

@@ -50,6 +50,6 @@ def truncate(truncate_at, options = {})
         length_with_room_for_omission
       end
 
-    self[0...stop] + options[:omission]
+    "#{self[0...stop]}#{options[:omission]}"
   end
 end