Launchpad currently recommends translating gnome-disk-utility in Ubuntu Bionic.

Template "gnome-disk-utility" in Ubuntu Bionic package "gnome-disk-utility"

Language Status Untranslated Need review Changed Last Edited By
Cherokee 100.00  100.0% untranslated 711 711 0 0
Dakota 100.00  100.0% untranslated 711 711 0 0
Hawaiian 100.00  100.0% untranslated 711 711 0 0
Inuktitut 100.00  100.0% untranslated 711 711 0 0
Lakota 100.00  100.0% untranslated 711 711 0 0
Ojibwe 100.00  100.0% untranslated 711 711 0 0
Spanish 000.00  100.0% translated 0 0 18 18 2018-07-16 09:37:19 UTC 2018-07-16 Daniel Mustieles
Tlingit 100.00  100.0% untranslated 711 711 0 0
Yiddish 100.00  100.0% untranslated 711 711 0 0
[ Change your preferred languages... View template & all languages... ]
Key to this table: “Unchanged” means Translated
and “untranslated” means just that, Untranslated

Other versions of gnome-disk-utility in Ubuntu