Second thoughts (and some coffee): changing <literal>buster/updates</literal>
to
<literal><replaceable>releasename</replaceable>/updates</literal>
ought to be enough, and might be okay for translators. As long as we
don't accidentally use &releasename;.
--
JBR with qualifications in linguistics, experience as a Debian
sysadmin, and probably no clue about this particular package
