Adds rel="noopener noreferrer" to _blank links inside comments
Adds rel="noopener noreferrer" to _blank links inside comments

For more details, check out https://mathiasbynens.github.io/rel-noopener/ for instance

Signed-off-by: Thomas Citharel <89dface3068b71770c281124cd00312268ab9ff6@tcit.fr>

andreas-p/nextcloud-server,andreas-p/nextcloud-server,michaelletzgus/nextcloud-server,nextcloud/server,andreas-p/nextcloud-server,nextcloud/server,michaelletzgus/nextcloud-server,michaelletzgus/nextcloud-server,michaelletzgus/nextcloud-server,nextcloud/server,andreas-p/nextcloud-server,andreas-p/nextcloud-server,nextcloud/server