i18n Translations
Available since v. 1.45.*
i18n Translations allows you to search all translations in all languages ​​installed on your Jira instance.
But why? …
Because in many places of Jira, for example in Workflow Properties - Transition titles and buttons (jira.i18n.submit or jira.i18n.title), but also in add-ons you can use i18n to try add your own translations if the vendor did not foresee them.
This this functionality:
search for all translations, even those not visible (e.g. translations in emails, etc.) and cannot be searched using InProduct translation for Jira
does not allow adding new translations
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If you want to read more about i18n go here https://developer.atlassian.com/server/framework/atlassian-sdk/internationalising-your-plugin/