There are a number of i18n messages in the Cite extension that don't seem to be actually localized. See below. It seems it is better to eliminate these messages - I especially don't see a reason to let HTML structures be localized. In Parsoid land, we are relying on CSS to get different formatting and localization of citations. Eliminating unused customizations could simplify the CSS rules that need to be written and maintained in some cases.
[subbu@earth:~/work/wmf/core/extensions/Cite] git grep cite_references_link_one i18n
i18n/en.json: "cite_references_link_one": "<li id=\"$1\"$4><span class=\"mw-cite-backlink\">[[#$2|↑]]</span> $3</li>",
i18n/qqq.json: "cite_references_link_one": "{{notranslate}}\n\nParameters:\n* $1 - references key\n* $2 - ref key\n* $3 - reference text\n* $4 - optional CSS class for direction",
[subbu@earth:~/work/wmf/core/extensions/Cite] git grep cite_reference_link i18n
i18n/en.json: "cite_reference_link": "<sup id=\"$1\" class=\"reference\">[[#$2|[$3]]]</sup>",
i18n/qqq.json: "cite_reference_link": "{{notranslate}}\n\nParameters:\n* $1 - ref key\n* $2 - references key\n* $3 - link label",