Launchpad currently recommends translating gnome-themes-standard in Ubuntu Mantic.

Template "gnome-themes-standard" in Ubuntu Mantic package "gnome-themes-standard"

Language Status Untranslated Need review Changed Last Edited By
Cherokee 100.00  100.0% untranslated 6 6 0 0
Dakota 100.00  100.0% untranslated 6 6 0 0
Hawaiian 100.00  100.0% untranslated 6 6 0 0
Inuktitut 100.00  100.0% untranslated 6 6 0 0
Lakota 100.00  100.0% untranslated 6 6 0 0
Louisiana French 100.00  100.0% untranslated 6 6 0 0
Ojibwe 100.00  100.0% untranslated 6 6 0 0
Pennsylvania German 100.00  100.0% untranslated 6 6 0 0
Spanish 000.00  100.0% translated 0 0 1 1 2018-02-16 17:21:53 UTC Daniel Mustieles
Tlingit 100.00  100.0% untranslated 6 6 0 0
Yiddish 100.00  100.0% untranslated 6 6 0 0
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Key to this table: “Unchanged” means Translated
and “untranslated” means just that, Untranslated

Other versions of gnome-themes-standard in Ubuntu