app/views/user_mailer/activation_code.text.erb
<%= _('Hi, %{recipient}!') % { recipient: @recipient } %>
<%= _('Welcome to %{environment}!') % { environment: @environment.name } %>
<%= word_wrap(_('To activate your account you must enter your activation '\
'code. To do so, access your account or follow the link: '\
'%{activation_url}') % { activation_url: @activation_url }) %>
<%= _('Your activation code is: %s') % @short_activation_code %>
<%= _("Greetings,") %>
--
<%= _('%s team.') % @environment.name %>
<%= @url %>