More spelling issues

Kimberly said I should post spelling errors here. On the subscriptions page when a user is logged in you get

"Your current subscriptions are listed here. You can renew, cancel or updgrade your subscriptions by using the forms below."

Upgrade is spelled incorrectly. Is there any documentation on changing the poorly worded default text of the plugin? In such a way as to not have it overwritten when there are plugin updates?

I have asked this question a few times.