Launchpad currently recommends translating mailman in Ubuntu Cosmic.

Template "mailman" in Ubuntu Cosmic package "mailman"

Language Status Untranslated Need review Changed Last Edited By
Cherokee 100.00  100.0% untranslated 1471 1471 17 17 0 2013-06-17 04:14:47 UTC 2013-06-17
Dakota 100.00  100.0% untranslated 1471 1471 0 0
Hawaiian 100.00  100.0% untranslated 1471 1471 0 0 2012-02-13 06:17:37 UTC 2012-02-13
Inuktitut 100.00  100.0% untranslated 1471 1471 0 0
Lakota 100.00  100.0% untranslated 1471 1471 0 0
Ojibwe 100.00  100.0% untranslated 1471 1471 0 0
Spanish 008.91  91.0944935418% translated  8.90550645819% untranslated 131 131 0 194 194 2016-10-23 08:26:43 UTC 2016-10-23 Jesus Delgado
Tlingit 100.00  100.0% untranslated 1471 1471 0 0
Yiddish 100.00  100.0% untranslated 1471 1471 0 0
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Key to this table: “Unchanged” means Translated
and “untranslated” means just that, Untranslated

Other versions of mailman in Ubuntu