luci-app-nextdns: fix i18n compile warn

Message contains an embedded URL.
Better move it out of the translatable string

Signed-off-by: Paul Donald <newtwen+github@gmail.com>

applications/luci-app-nextdns/htdocs/luci-static/resources/view/nextdns/overview.js

@@ -10,7 +10,7 @@ return view.extend({
 			_('NextDNS Configuration.')
 			+ '<br />'
 			+ _('For further information, go to \
-				<a href="https://nextdns.io" target="_blank">nextdns.io</a>.'));
+				%s.'.format('<a href="https://nextdns.io" target="_blank">nextdns.io</a>')));
 
 		s = m.section(form.TypedSection, 'nextdns', _('General'));
 		s.anonymous = true;