[mod] improve description of the prefernces URL in the "COOKIES" tab

Closes: https://github.com/searxng/searxng/issues/4272
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

searx/templates/simple/preferences/cookies.html

@@ -40,7 +40,7 @@
   </pre>{{- '' -}}
 </div>{{- '' -}}
 <p class="small_font">
-  {{- _('Specifying custom settings in the preferences URL can be used to sync preferences across devices.') -}}
+  {{- _('A URL containing your preferences. This URL can be used to restore your settings on a different device.') -}}
 </p>
 <h4>
   {{- _('Copy preferences hash') -}}:{{- '' -}}