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

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

===

<%= t 'devise.mailer.reconfirmation_instructions.explanation' %>

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

<%= t 'devise.mailer.reconfirmation_instructions.extra' %>