app/views/devise/mailer/unlock_instructions.html.erb
<h1><%= t('.unlock_instructions') %></h1>
<p><%= t('general.hello') %> <%= @resource.email %>!</p>
<p><%= t('.account_locked') %></p>
<p><%= t('.click_below') %></p>
<hr />
<p><%= link_to t('.unlock_account'), unlock_url(@resource, :unlock_token => @token) %></p>