Bug 1889687 - Ensure new Translations settings is hidden form search r=Gijs,settings-reviewers

Ensures that the new Translations Settings subpage
has the `data-hidden-from-search` attribute so that
stubbed content is not discoverable accidentally.

Differential Revision: https://phabricator.services.mozilla.com/D206669

browser/components/preferences/main.js

@@ -1918,6 +1918,11 @@ var gMainPane = {
     if (
       Services.prefs.getBoolPref("browser.translations.newSettingsUI.enable")
     ) {
+      const translationsSettings = document.getElementById(
+        "translations-settings-page"
+      );
+      translationsSettings.setAttribute("data-hidden-from-search", "false");
+      translationsSettings.hidden = false;
       gotoPref("translations");
     } else {
       gSubDialog.open(

browser/components/preferences/translations.inc.xhtml

@@ -4,9 +4,11 @@
 
 <script src="chrome://browser/content/preferences/translations.js"/>
 
-<div xmlns="http://www.w3.org/1999/xhtml"
+<div id="translations-settings-page"
+     xmlns="http://www.w3.org/1999/xhtml"
      xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
      data-category="paneTranslations"
+     data-hidden-from-search="true"
      hidden="true">
 
   <button id="translations-settings-back-button" class="back-button"