Launchpad currently recommends translating indicator-session in Ubuntu RTM 15.04.

Template "indicator-session" in Ubuntu RTM 15.04 package "indicator-session"

Language Status Untranslated Need review Changed Last Edited By
Cherokee 100.00  100.0% untranslated 29 29 1 1 0 2016-03-16 09:46:09 UTC
Dakota 100.00  100.0% untranslated 29 29 0 0
Hawaiian 100.00  100.0% untranslated 29 29 0 0
Inuktitut 100.00  100.0% untranslated 29 29 0 0
Lakota 100.00  100.0% untranslated 29 29 0 0
Louisiana French 100.00  100.0% untranslated 29 29 0 0
Ojibwe 100.00  100.0% untranslated 29 29 0 0
Pennsylvania German 100.00  100.0% untranslated 29 29 0 0
Spanish 000.00  100.0% translated 0 0 2 2 2016-03-30 15:20:00 UTC Víctor R. Ruiz
Tlingit 100.00  100.0% untranslated 29 29 0 0
Yiddish 100.00  100.0% untranslated 29 29 0 0
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Key to this table: “Unchanged” means Translated
and “untranslated” means just that, Untranslated

Other versions of indicator-session in Ubuntu RTM