NEW STRING 1: Put in warning message at top colored red, lets use bootstrap to visually enhance this.  Add to
"WARNING: Proceed with caution.  This action is irreversible and will permanently delete this Kunena instillation."

CURRENT STRING 2: Warning about what will be deleted.
"All user data in the database including categories, topics, messages, and attachments will be deleted.  Kunena installation directories will be removed from you Joomla install including the Kunena Site Component, Kunena Administrator Component, and Kunena Library. If you don't have a backup there is no way to go back and restore this data."

NEW STRING 3: Really should be in a seperate string as this is instructions on how to proceed.
"In order to execute the process, you need to log in with a super-administrator account.  If you have Two-Factor Authentication enabled you may need to include the authenticator code to proceed."