Looks like "Invite Users" is handled by a plugin, and therefore can't be customized the way "Create Users" can.
BTW, if you're happy with using "Create Users" but don't understand Velocity Macro files (I don't!), you can customize part of the email by editing the "template.jira.user.created.intro" property in the following file (and then restarting JIRA):
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...+ reading Fantasy). The same is true for him at the bank he works for: Efficiency is key when time literally equals money. Read on to learn how Sergey makes most of the time he has by...
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