hugo-theme-relearn/layouts/partials/sidebar/element/historyclearer.html

{{- $icon := .element.icon | default "history" }}
{{- if and $icon (not (findRE ".*?\\bfa-\\w.*?" $icon)) }}
  {{- $icon = printf "fa-fw fas fa-%s" $icon }}
{{- end }}
            <li class="R-historyclearer">
              <div class="padding menu-control">
                <i class="{{ $icon }}"></i>
                <span>&nbsp;</span>
                <div class="control-style">
                  <button>{{ T "Clear-History" }}</button>
                </div>
                <div class="clear"></div>
              </div>
            </li>