searxng/searx/templates/oscar/languages.html

<label class="visually-hidden" for="language">{{ _('Language') }}</label>
<select class="language custom-select form-control" id="language" name="language" accesskey="l">
  <option value="all" {% if current_language == 'all' %}selected="selected"{% endif %}>{{ _('Default language') }}</option>
{%- for lang_id,lang_name,country_name,english_name in language_codes | sort(attribute=1) -%}
  <option value="{{ lang_id }}" {% if lang_id == current_language %}selected="selected"{% endif %}>
    {{- lang_name }} {% if country_name %}({{ country_name }}) {% endif %}- {{ lang_id -}}
  </option>
{%- endfor -%}
</select>