app/views/devise/mailer/unlock_instructions.html.erb
<p><%= t('salutation', name: @email) %></p>
<p><%=t('devise.mailer.unlock.info') %></p>
<p><%=t('devise.mailer.unlock.link_instructions') %></p>
<p><%= link_to t('devise.mailer.unlock.link_text'), unlock_url(@resource, unlock_token: @token) %></p>