chill_hugoplate/themes/hugoplate/layouts/partials/components/language-switcher.html

<!-- Language List -->
{{ $class := .Class }}
{{ $context := .Context }}
{{ $pageLang := $context.Lang }}
{{ $base:= urls.Parse site.BaseURL }}
{{ $siteLanguages := site.Home.AllTranslations }}
{{ $pageLink := replace (replace $context.RelPermalink (add $pageLang "/") "") $base.Path "/" }}

{{ if $context.IsTranslated }}
  <select class="{{ $class }} lang-select" onchange="location = this.value">
    {{ range $siteLanguages }}
      {{ if eq (string $pageLang) (string .Language) }}
        <option
          id="{{ .Language }}"
          value="{{ replace (add .RelPermalink $pageLink) `//` `/` }}"
          selected>
          {{ .Language.LanguageName }}
        </option>
      {{ else }}
        <option
          id="{{ .Language }}"
          value="{{ replace (add .RelPermalink $pageLink) `//` `/` }}">
          {{ .Language.LanguageName }}
        </option>
      {{ end }}
    {{ end }}
  </select>
{{ end }}