i18n:name string hack

In order for things like the preferences page to display titles in the form:

MKDoc.org : Bugs : Unstable 1.8 : Normal : i18n:name string hack : Account Preferences

There is this code for the <title>:

<title
  petal:content="structure string:${self/parent_alternate_title}${string:account-preferences}"
>
  Account Preferences
</title>
 

And this is supposed to pick up the string from the <h1>:

      <h1>
        <a
id="page_content"
name="page_content"
i18n:attributes="xml:lang two-letter-language-code;
                 lang     two-letter-language-code;
                 dir      text-direction"
i18n:translate="account-preferences"
        >
         Account Preferences
        </a>
      </h1>