Hello @Michel ,
You can translate custom field by going to Administration -> Issues -> Custom Fields -> Click "..." on the right side and then choose Translation options.
Regarding system fields, these cannot be translated yet, if I am correct. There is a feature request for this here: https://jira.atlassian.com/browse/JRACLOUD-21293
For Issue links, navigate to Administration -> Issues -> Issue linking. You cannot actually translate them, just add a new one in your language.
Regards,
Adam
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