Order themes by their shown name

include/admin/templates.inc.php

@@ -230,6 +230,9 @@ foreach ($stack as $theme => $info) {
         }
     }
 }
+uasort($data['templates'], function($a, $b) {
+    return strnatcasecmp($a['info']['name'], $b['info']['name']);
+});
 
 $data['cur_tpl']         = $data['templates'][$serendipity['template']];
 $data['cur_tpl_backend'] = $data['templates'][$serendipity['template_backend']];