JSFiddle - React, Tailwind, and code Playground

HTML

<span class="thanksButton">
    <a href="showthread.php?action=remove_thank"></a>
    <a href="showthread.php?action=thank"></a>
</span>

JavaScript

var removeLink = $('a[href*="showthread.php?action=remove_thank"]');
var thanksLink = $('a[href*="showthread.php?action=thank"]');

if (removeLink) { removeLink.text('Nie dziękuj') }
if (thanksLink) { thanksLink.text('Podziękuj') }