app/views/categories/_form.html.erb
<%= form_for(@category) do |f| %>
<div class="field">
<%= f.label :name %><br>
<%= f.text_field :name, class:'form-control' %>
</div>
<div class="field">
<%= f.label :ca_name %><br>
<%= f.text_field :ca_name, class:'form-control' %>
</div>
<div class="field">
<%= f.label :es_name %><br>
<%= f.text_field :es_name, class:'form-control' %>
</div>
<br/>
<div class="actions">
<%= f.submit class: 'btn btn-primary' %>
</div>
<% end %>