publiccode.si/site/layouts/shortcodes/translation_status.html

{{- $allgood := true -}} <!-- "allgood" will say whether all translations are fine -->
{{- range .Site.Pages -}} <!-- range through all pages -->
  {{- $uptodate := true -}} <!-- reset uptodate var -->
  {{- $main_date := .Lastmod -}} <!-- last modification date of EN file -->
  {{- range .Translations -}} <!-- range through all translations of .Page -->
    {{- if and (.IsTranslated) (.IsPage) -}}
      {{- $i18n_date := .Lastmod -}}
      {{- if ($main_date.After $i18n_date) -}} <!-- EN .Lastmod is newer than .Lastmod of translation --> 
        {{- $uptodate = false -}} <!-- at least one translation failed -->
        {{- $allgood = false -}}  <!-- at least one translation failed -->
      {{- end -}}
    {{- end -}}
  {{- end -}}
  {{- if eq $uptodate false }} <!-- if at least one translation failed -->
    <h3><a href="{{ .Permalink }}">{{ .File.Path }}</a></h3>
    <table class="transstatus">
      <thead><tr>
        <th>Lang</th>
        <th>Page</th>
        <th>Translation date</th>
        <th>Original date</th>
        <th>Version Diff</th>
      </tr></thead>
      {{ $main_date := .Lastmod -}} <!-- same logic as above, now with output -->
      {{- $main_version := .Params.version -}} <!-- "version" value of file's front matter -->
      {{ range sort .Translations ".Lang" }}
        {{- if and (.IsTranslated) (.IsPage) -}}
          {{- $i18n_date := .Lastmod -}}
          {{- $i18n_version := .Params.version -}}
          {{- if ($main_date.After $i18n_date) -}}
          <tr>
            <td>{{ .Lang | upper }}</td>
            <td><a href="{{ .Permalink }}">{{ .File.Path }}</a></td>
            <td>{{ $i18n_date.Format "2006-01-02" }} (v{{ $i18n_version }})</td>
            <td>{{ $main_date.Format "2006-01-02" }} (v{{ $main_version }})</td>
            <td>{{ sub $main_version $i18n_version }}</td>
          </tr>
          {{- end -}}
        {{- end -}}
      {{ end }}
    </table>
  {{- end -}}
{{- end -}}

{{- if eq $allgood true -}}
    <p style="text-align:center;">Everything is up to date! &#128077;</p>
{{- end -}}