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Ouhlala... ça pique les yeux ! Il y a une fonction dans l'éditeur de message sur le forum pour mettre en forme le code hein... Mais bref, voici le code corrigé :

<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 src="{$urls.img_lang_url}{$current_language.id_lang}.jpg" alt="{$language.iso_code}"/> {$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"><img src="{$urls.img_lang_url}{$current_language.id_lang}.jpg" alt="{$language.iso_code}"/> {$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 == $current_language.id_lang} selected="selected"{/if}><img src="{$urls.img_lang_url}{$current_language.id_lang}.jpg" alt="{$language.iso_code}"/> {$language.name_simple}</option>
        {/foreach}
      </select>
    </div>
  </div>
</div>

En gros il faut utiliser les variables mises à disposition par Prestashop