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

<%= t 'user_mailer.welcome.title', name: @resource.account.username %> <%= t 'user_mailer.welcome.explanation' %>

===

<%= t 'user_mailer.welcome.full_handle' %> (<%= "@#{@resource.account.local_username_and_domain}" %>)
<%= t 'user_mailer.welcome.full_handle_hint', instance: @instance %>

---

<%= t 'user_mailer.welcome.edit_profile_step' %>

=> <%= settings_profile_url %>

<%= t 'user_mailer.welcome.final_step' %>

=> <%= web_url %>