app/views/devise/mailer/confirmation_instructions.html.erb
<p><%= t('.greeting', recipient: @resource.email, default: "Welcome #{@resource.email}!") %></p>
<p><%= t('.instruction', default: 'You can confirm your account email through the link below:') %></p>
<p>
<%= link_to t('.action', default: 'Confirm my account'),
confirmation_url(@resource, confirmation_token: @token) %>
</p>