Yes - unpack the plugin's code, edit the file containing the message, and re-pack it.
That's assuming you are talking about messages that are in the utilities, rather than the utilities re-using the messages in the core of Jira.
To be sure of this, which error message are you wanting to change?
It started as any story starts, on a normal, rainy day. Admin meets App, and her name was Klok2, and like any first relationship we were both trying to make it work but neither one knew what...
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