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

{{ $up_to_date := true }}
{{ range .Site.Pages }}
    {{ $maindate := .Lastmod }}
    {{ range .Translations }}
      {{ if and (.IsTranslated) (.IsPage) }}
        {{ $i18n_date := .Lastmod }}
        {{ if ($maindate.After $i18n_date) }}
            {{ $up_to_date := false }}
        {{ end }}
      {{ end }}
    {{ end }}
{{ end}}

{{ if eq $up_to_date false }}
    {{ range .Site.Pages }}
    <ul>
        {{ $maindate := .Lastmod }}
        {{ range .Translations }}
            {{ if and (.IsTranslated) (.IsPage) }}
                {{ $i18n_date := .Lastmod }}
                {{ if ($maindate.After $i18n_date) }}
                <li>
                    {{ .Lang }} | <a href="{{ .Permalink }}">{{ .RelPermalink }}</a> | {{ $i18n_date }} is older than {{ $maindate }}
                </li>
                {{ end }}
            {{ end }}
        {{ end }}
    </ul>
    {{ end}}
{{ else }}
    <p style="text-align:center;">Everything is up to date! &#128077;</p>
{{ end}}