Classic Universal Login - how to include terms of use language on Log In tab

We are using the Class Universal Login modal, and we would like to be able to include the terms/privacy policy acceptance language in the modal each time an existing user logs in to our application. I understand that this text for the Sign Up tab of the modal is customizable in signUpTerms. We want to include similar language on the Log In tab of the modal.

languageDictionary: { 
        signUpTerms: 'By creating an account, you agree to the Privacy Policy and Terms of Use.'

We are using Lock. I did note in this previous case it mentions modifying Lock somehow to do this, but it does not provide specifics.