searxng/searx/templates/oscar/messages/save_settings_successfull.html

<div class="alert alert-success fade in" role="alert">
    <button class="close" data-dismiss="alert" type="button">
        <span aria-hidden="true">×</span>
        <span class="sr-only">Close</span>
    </button>
    <strong>{{ _('Well done!') }}</strong>
    {{ _('Settings saved successfully.') }}
</div>