Artweb-design adva cms

While themes were moved to adva_themes engine, export link was missed from page design.

I recommend to retrieve it using
- vendor/adva/engines/adva_themes/app/views/admin/themes/_theme.html.erb

<ul id="theme_list">
    <li class="theme<%= ' current' if theme.active? %>">
      <h4 title="<%= theme.theme_id %>"><%= theme.name %></h4>
      <p>
            <%= "v#{theme.version}" if theme.version.present? %>
        <%= t(:'adva.common.by_author', :author => theme.author_link) %>
      </p>
        <%= link_to theme_image_tag(theme.theme_id, theme.preview.base_url, :title => theme.theme_id), index_path([theme, :'theme/file']) if theme.preview %>

        <ul class="options">
        <% if theme.active? %>
                <li><%= link_to_deactivate_theme(theme) %></li>
        <% else %>
                <li><%= link_to_activate_theme(theme) %></li>
        <% end %>
        <li><%= link_to t(:'adva.themes.links.edit'), edit_admin_theme_path(@site, theme) %></li>
        <li><%= link_to t(:'adva.themes.links.export'), export_admin_theme_path(@site, theme.id) %></li>
        <li><%= link_to t(:'adva.themes.links.delete'), admin_theme_path(@site, theme), { :confirm => t(:'adva.themes.confirm_uninstall'), :method => :delete }  %></li>
      </ul>
    </li>
</ul>

And somewhere in locales

en:
  adva:
    themes:
      links:
        export:  'Download as zip'