Merge pull request #1140 from OpenTechFund/fix/invalid-activation-message

opentech/apply/users/templates/users/activation/email.txt

opentech/apply/users/templates/users/activation/invalid.html

.../apply/users/templates/users/password_reset/complete.html

...tech/apply/users/templates/users/password_reset/done.html

...tech/apply/users/templates/users/password_reset/form.html

opentech/apply/users/utils.py

opentech/settings/base.py