打开模板文件/themes/classic/ps_languageselector/ps_languageselector.tpl，找到{$current_language.name_simple}，约30行左右，在前面添加

<img alt="{$current_language.name_simple}" src="{$urls.base_url}/img/l/{$language.id}.jpg" width="16" height="11">

这是当前语言前面的国旗图标现实。

继续找到下拉框中更多语言，找到{$language.name_simple}，约36行左右，在前面添加

<img alt="{$current_language.name_simple}" src="{$urls.base_url}img/l/{$language.id_lang}.jpg" width="16" height="11">

完整的ps_languageselector.tpl代码：

{**
 * Copyright since 2007 PrestaShop SA and Contributors
 * PrestaShop is an International Registered Trademark & Property of PrestaShop SA
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Academic Free License 3.0 (AFL-3.0)
 * that is bundled with this package in the file LICENSE.md.
 * It is also available through the world-wide-web at this URL:
 * https://opensource.org/licenses/AFL-3.0
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to [email protected] so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade PrestaShop to newer
 * versions in the future. If you wish to customize PrestaShop for your
 * needs please refer to https://devdocs.prestashop.com/ for more information.
 *
 * @author    PrestaShop SA and Contributors <[email protected]>
 * @copyright Since 2007 PrestaShop SA and Contributors
 * @license   https://opensource.org/licenses/AFL-3.0 Academic Free License 3.0 (AFL-3.0)
 *}
<div id="_desktop_language_selector">
  <div class="language-selector-wrapper">
    <span id="language-selector-label" class="hidden-md-up">{l s='Language:' d='Shop.Theme.Global'}</span>
    <div class="language-selector dropdown js-dropdown">
      <button data-toggle="dropdown" class="hidden-sm-down btn-unstyle" aria-haspopup="true" aria-expanded="false" aria-label="{l s='Language dropdown' d='Shop.Theme.Global'}">
        <span class="expand-more"><img alt="{$current_language.name_simple}" src="{$urls.base_url}/img/l/{$language.id}.jpg" width="16" height="11"> {$current_language.name_simple}</span>
        <i class="material-icons expand-more">&#xE5C5;</i>
      </button>
      <ul class="dropdown-menu hidden-sm-down" aria-labelledby="language-selector-label">
        {foreach from=$languages item=language}
          <li {if $language.id_lang == $current_language.id_lang} class="current" {/if}>
            <a href="{url entity='language' id=$language.id_lang}" class="dropdown-item" data-iso-code="{$language.iso_code}"><img alt="{$current_language.name_simple}" src="{$urls.base_url}img/l/{$language.id_lang}.jpg" width="16" height="11"> {$language.name_simple}</a>
          </li>
        {/foreach}
      </ul>
      <select class="link hidden-md-up" aria-labelledby="language-selector-label">
        {foreach from=$languages item=language}
          <option value="{url entity='language' id=$language.id_lang}"{if $language.id_lang == $current_language.id_lang} selected="selected"{/if} data-iso-code="{$language.iso_code}">
            {$language.name_simple}
          </option>
        {/foreach}
      </select>
    </div>
  </div>
</div>