{{ $pages := .CurrentSection.Pages }}
{{ with site.Params.language_alternatives }}
  {{ range . }}
          {{ with (where $.CurrentSection.Translations ".Lang" . ) }}
          {{ $p := index . 0 }}      
          {{ $pages = $pages | lang.Merge $p.Pages }}
          {{ end }}
  {{ end }}
 {{ end }}  
<div class="panel-group" id="blog-archive">
  {{ range $i, $e := $pages.GroupByPublishDate "2006" }}
  <div class="panel panel-default">
    <div class="panel-heading">
      <h4 class="panel-title">
      <a data-toggle="collapse" data-parent="#blog-archive" href="#collapse-{{ .Key }}">
      {{ .Key }}</a>
      </h4>
    </div>
    <div id="collapse-{{ .Key }}" class="panel-collapse collapse{{ if eq $i 0 }} show{{ end }}">
      <div class="panel-body">
        <ul class="list-group">
          {{ range .Pages }}
          {{ $isForeignLanguage := (ne .Lang $.Lang)}}
          <li class="list-group-item"><a href="{{ .Permalink }}"{{ if $isForeignLanguage }} target="_blank" {{ end }}>{{ .LinkTitle }}</a> <span class="date">{{ .PublishDate.Format "Jan 2" }}</span>{{ if $isForeignLanguage }} <small>({{ .Lang | upper }})</small>{{ end }}</li>
          {{ end }}
        </ul>
      </div>
    </div>
  </div>
  {{ end }}
</div>