Merge pull request #2863 from HyphaApp/fix/email-template-variable-fixes

...ply/activity/templates/messages/email/applicant_base.html

hypha/apply/activity/templates/messages/email/base.html

...ctivity/templates/messages/email/invited_to_proposal.html

hypha/apply/funds/templates/funds/email/confirmation.html

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

...pply/users/templates/users/email_change/confirm_email.txt

hypha/apply/users/templates/users/password_reset/email.txt

hypha/apply/users/utils.py

hypha/public/utils/context_processors.py