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In this context, if we attempt to apply translations by project we will need to get rid of or work around the base Jira functionality that we rely on and create an approach which will modify the UI values of the html by javascript functions and will be tied by the UI itself. And the potential solution could still be unstable and unportable across Jira versions.
That being said, we are evaluating whether it's even worth the risks working on the alternatives at the moment, because offering something unstable and unreliable to our users is the last thing we want to do.