web/_includes/footer.html

<!-- The Footer -->

<footer>
  <div class="container pl-lg-4 pr-lg-4">
    <div class="d-flex justify-content-between align-items-center text-muted ml-md-3 mr-md-3">
      <div class="footer-left">
        <p class="mb-0">
          © {{ 'now' | date: "%Y" }}
          <a href="{{ site.social.links[0] }}">{{ site.social.name }}</a>.
          {% if site.data.locales[site.lang].copyright.brief %}
          <span data-toggle="tooltip" data-placement="top"
            title="{{ site.data.locales[site.lang].copyright.verbose }}">{{ site.data.locales[site.lang].copyright.brief }}</span>
          {% endif %}
        </p>
      </div>

      <div class="footer-right">
        <p class="mb-0">

          {%- capture _platform -%}
          <a href="https://jekyllrb.com" target="_blank" rel="noopener">Jekyll</a>
          {%- endcapture -%}

          {%- capture _theme -%}
          <a href="https://github.com/cotes2020/jekyll-theme-chirpy" target="_blank" rel="noopener">Chirpy</a>
          {%- endcapture -%}

          {{ site.data.locales[site.lang].meta
            | default: 'Using the :PLATFORM theme :THEME.'
            | replace: ':PLATFORM', _platform | replace: ':THEME', _theme
          }}
        </p>
      </div>
    </div>
  </div>
</footer>