After Anthony Towns suggestion that he believes that a "should" would be enough, I agree with his arguments.
Here a corrected patch which s/must/should. I will propose the enforced use of po-debconf as a release goal for Lenny.
--- policy.sgml.old 2006-12-13 22:24:05.534361649 +0100
+++ policy.sgml 2006-12-13 22:26:52.159683953 +0100
@@ -1221,6 +1221,13 @@
</p>
<p>
+ Packages which use the Debian Configuration management
+ specification should allow for translation of their messages
+ by using a gettext-based system such as the one provided by
+ the <package>po-debconf</package> package.
+ </p>
+
+ <p>
Packages should try to minimize the amount of prompting
they need to do, and they should ensure that the user
will only ever be asked each question once. This means
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