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To my mind, {{fr}} and {{subst:fr}} should both give the same output when rendered, but they don't:

http://en.wiktionary.org/w/api.php?action=parse&text={{fr}}{{subst:fr}}

Gives

<p>French{{subst:fr}}</p>

instead of

<p>FrenchFrench</p>

Substitution is handled by pre-save transform. To include that in parsing, use "pst" parameter.

http://en.wiktionary.org/w/api.php?action=parse&text={{fr}}{{subst:fr}}&pst

<p>FrenchFrench</p>

Thanks, have added this to the documentation.

* <code>pst</code>: Do a pre-save-transform (makes <nowiki>{{subst:}}</nowiki> work properly)