Our detectives are back with the following intel on this WordPress site
The site is using the stauden.forssman.de theme by botho .
We could identify 2 plugins (there might be more) -
iThemes Security (formerly Better WP Security)
This information was last updated 16 April, 2017
iThemes Security is the #1 WordPress Security Plugin
This plugin will improve SEO by helping search enginess better index your site using sitemaps.