JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>
<ul class="uk-navbar-nav">
  <li class=" uk-active">
    <a href="/">Accueil</a>
  </li>
  <li class="uk-parent" data-uk-dropdown="">
    <a href="/menus/nos-menus">Menus</a>
    <div class="uk-dropdown uk-dropdown-navbar">
      <ul class="uk-nav uk-nav-navbar">
        <li class="">
          <a href="/menus/a-la-carte">A la carte</a>
        </li>
        <li class="">
          <a href="/menus/nos-menus">Nos menus</a>
        </li>
        <li class="">
          <a href="/menus/carte-des-vins">Carte des vins</a>
        </li>
      </ul>
    </div>
  </li>
  <li class="">
    <a href="/infos-pratiques">Infos pratiques</a>
  </li>
  <li class="">
    <a href="/contact">Contact</a>
  </li>
  <li class="">
    <a href="/tel:+33385858585">0385858585</a>
  </li>
</ul>

JavaScript

// Check all the links and change href if attribute value begins with '/tel:' by removing / 
var str = "";
$(".uk-navbar-nav li a").each(function(){
	str = $(this).attr("href");
  
  if(str.substr(0, 5) === '/tel:'){
  	str = str.slice(1);
    $(this).attr("href", str);
  }
  
});