Copy fix for nothing personal page [fix #15558]

bedrock/firefox/templates/firefox/nothing-personal/index.html

@@ -89,7 +89,7 @@ <h2 class="c-text-title">Ok, we admit it: we’re fast, reliable <em class="u-te
            </div>
           {% call browser_border(class='c-things-browser', heading="What would Firefox do?") %}
             <img class="c-things-foxy-sticker" data-animation="dependent-pop-in" src="{{ static('img/firefox/nothing-personal/foxy-sticker.svg') }}" alt="">
-            <h4 class="c-mono-title">Things we’d rather do than go through your personal data</h4>
+            <h4 class="c-mono-title">Things we’d rather do than go through your private data</h4>
             <div id="things-list" class="c-things-list-container">
               <ul class="c-things-list mzp-u-list-styled">
                 <li>Work out to elevator music</li>