Localizing Kibana into Unsupported Languages

Hello everyone! I'm running Kibana in Docker and looking for a way to fully localize it. I created a separate file ru-RU.json, added translations to it, made changes to kibana/x-pack/.i18nrc.json and kibana/node_modules/@kbn/i18n/src/core/locales.js, but not all interface elements are being translated. However, if I replace fr-FR.json with my file, there is no issue. Could you please advise where else changes need to be made for Kibana to fully read the ru-RU.json file?