app/views/devise/mailer/unlock_instructions.html.erb
<p><%= t('.greeting', recipient: @resource.email, default: "Hello #{@resource.email}!") %></p>
<p><%= t('.message', default: 'Your account has been locked due to an excessive amount of unsuccessful sign in attempts.') %></p>
<p><%= t('.instruction', default: 'Click the link below to unlock your account:') %></p>
<p><%= link_to t('.action', default: 'Unlock my account'), unlock_url(@resource, unlock_token: @token) %></p>