app/views/devise/sessions/new.html.erb
<h2><%= t 'app.login' %></h2>
<%= form_for("user", :url => user_session_path) do |f| %>
<%= flash[:alert] %>
<%= f.label :email %>
<%= f.text_field :email, autofocus: true %>
<%= f.label :password %>
<%= f.password_field :password %><br>
<%= f.submit t('app.login'), class:"btn btn-primary" %><br>
<% end %>
<%= link_to 'Glemt passord?', new_user_password_path %>