Our customer typically creates user accounts for their users and checks the generate password box, then marks the user as requiring a password change on first login. 

Is there a way to:

1. put the password strength requirements in the new user email
2. put the password strength requirements on the change password page
3. replace the "Please check with the Portal Administrator if you do not know the password requirements." message on the change password screen that appears after the user enters a new password that does not meet the requirements

All email templates can be customized per portal.

Enter Languages in Admin menu (DNN3/4 only!) and go to Language Editor.

In the file shown by default, scroll down to EMAIL..., depending on the registration type you are using.

HTH