Launchpad currently recommends translating gcc-9 in Ubuntu Focal.

Template "cpplib" in Ubuntu Focal package "gcc-9"

Language Status Untranslated Need review Changed Last Edited By
Cherokee 100.00  100.0% untranslated 216 216 0 0
Dakota 100.00  100.0% untranslated 216 216 0 0
Hawaiian 100.00  100.0% untranslated 216 216 0 0
Inuktitut 100.00  100.0% untranslated 216 216 0 0
Lakota 100.00  100.0% untranslated 216 216 0 0
Ojibwe 100.00  100.0% untranslated 216 216 0 0
Spanish 002.31  97.6851851852% translated  2.31481481481% untranslated 5 5 0 0 2020-04-16 21:36:31 UTC 2020-04-16 Fco. Javier Serrador
Tlingit 100.00  100.0% untranslated 216 216 0 0
Yiddish 100.00  100.0% untranslated 216 216 0 0
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Template "gcc" in Ubuntu Focal package "gcc-9"

Language Status Untranslated Need review Changed Last Edited By
Cherokee 100.00  100.0% untranslated 13264 13264 0 0
Dakota 100.00  100.0% untranslated 13264 13264 0 0
Hawaiian 100.00  100.0% untranslated 13264 13264 0 0
Inuktitut 100.00  100.0% untranslated 13264 13264 0 0
Lakota 100.00  100.0% untranslated 13264 13264 0 0
Ojibwe 100.00  100.0% untranslated 13264 13264 0 0
Spanish 029.30  70.7026537998% translated  29.2973462002% untranslated 3886 3886 0 0 2020-04-16 20:46:47 UTC 2020-04-16 Antonio Ceballos Roa
Tlingit 100.00  100.0% untranslated 13264 13264 0 0
Yiddish 100.00  100.0% untranslated 13264 13264 0 0
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Template "libstdc++" in Ubuntu Focal package "gcc-9"

Language Status Untranslated Need review Changed Last Edited By
Cherokee 100.00  100.0% untranslated 10 10 0 0
Dakota 100.00  100.0% untranslated 10 10 0 0
Hawaiian 100.00  100.0% untranslated 10 10 0 0
Inuktitut 100.00  100.0% untranslated 10 10 0 0
Lakota 100.00  100.0% untranslated 10 10 0 0
Ojibwe 100.00  100.0% untranslated 10 10 0 0
Spanish 000.00  100.0% translated 0 0 0 2020-01-11 07:23:02 UTC 2020-01-11
Tlingit 100.00  100.0% untranslated 10 10 0 0
Yiddish 100.00  100.0% untranslated 10 10 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 gcc-9 in Ubuntu