webui: add titles to links.

package/thingino-webui/files/var/www/x/preview.cgi

@@ -106,6 +106,7 @@ for i in email ftp mqtt telegram webhook yadisk; do
 	let a = document.createElement('a')
 	a.href = 'plugin-send2<%= $i %>.cgi'
 	a.classList.add('btn','btn-outline-danger','mb-2')
+	a.title = 'Configure sent2<%= $i%> plugin'
 	a.append($('button[data-sendto=<%= $i %>] img'))
 	$('button[data-sendto=<%= $i %>]').replaceWith(a);
 }