You can edit the email templates in JIRA (presuming this is Server and not Cloud offering):
Alternatively, you can use a plugin such as JIRA Enterprise Mail Handler to edit both the templates and their use cases for a more complete solution - https://marketplace.atlassian.com/plugins/com.javahollic.jira.jemh-ui/server/overview
NB. JEMH is now available for Cloud, as well as server...
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