mastodon/app/views/user_mailer/confirmation_instructions.text.erb

<%= t 'devise.mailer.confirmation_instructions.title' %>

===

<%= t 'devise.mailer.confirmation_instructions.explanation', host: site_hostname %>

=> <%= confirmation_url(@resource, confirmation_token: @token) %>

<%= strip_tags(t('devise.mailer.confirmation_instructions.extra_html', terms_path: about_more_url, policy_path: terms_url)) %>

=> <%= about_more_url %>
=> <%= terms_url %>