SEO Extension: Enables important on-page features for search engine optimization (SEO). Expands 
						the page settings and any existing records, e.g. with a preview for Google search results (SERP), 
						Open Graph, Twitter Cards and a Focus Keyword. Sitemap.xml and robots.txt handling. Support for 
						Session Tracking (Google Analytics or Piwik) and href"lang" tags. Further features are shown in
						the extension manual.