JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.jquery.com/jquery-3.2.1.min.js"></script>
<a href="http://site.ru/en/post">Test link</a>

JavaScript

$(function() {
	$('a').each(function() {
  	$(this).attr('href', 
    	$(this).attr('href').replace('/en', '')
    )
  })
});