app/views/admin/case_studies/_form.html.erb
<%= simple_form_for([:admin, case_study]) do |f| %>
<%= render 'admin/shared/locale_tabs', f: f, field: :title do |locale| %>
<%= f.input t_field(:title, locale), label: CaseStudy.human_attribute_name(:title), as: :string %>
<% end %>
<%= render 'admin/shared/locale_tabs', f: f, field: :description do |locale| %>
<div class="description-trix-editor-<%=locale%>">
<%= f.rich_text_area t_field(:description, locale), label: CaseStudy.human_attribute_name(:description), as: :string %>
</div>
<% end %>
<%= f.input :position %>
<%= render 'admin/shared/locale_tabs', f: f, field: :file do |locale| %>
<%= f.input t_field(:file, locale), label: CaseStudy.human_attribute_name(:file) %>
<% end %>
<%= f.button :submit %>
<% end %>