Post heading is not translated

Problem/Motivation

Post heading of type

<p><a href="[message:author:url:absolute]">[message:author:display-name]</a> posted in <a href="[message:gurl]">[message:gtitle]</a></p>

is not translated on page .../post/% when default language is different from english (user is redirected to this page from Notification Center).
In this case "posted in " remains in english language.

Steps to reproduce

- fresh install with default language different from english
- make a post
- go url /post/% of this post