Improved Error page, CSP only for HTML documents
Improved Error page, CSP only for HTML documents

Database column "updated" renamed to "modified"
Copywriting for error page
Red toolbar color for error page
Error page content centered UI
Set CSP header only for HTML documents
Google Authorship markup is no longer supported
https://support.google.com/webmasters/answer/6083347
Navigation dir=auto only if contains RTL text
Removed async from script.js

laukstein/ajax-seo,laukstein/ajax-seo