Add host to logs for use with fail2ban

See merge request lemonldap-ng/lemonldap-ng!154

manager: Adapt html to stricter rules in angularjs >= 1.8.0

See merge request lemonldap-ng/lemonldap-ng!155

label and textarea elements in XHTML must have a matching closing tag
for strict XHTML conformity; when upgrading to angularjs 1.8.0, this
became mandatory even when used with angular because of some potential
XSS issue.

Without this change, the rendering of the modal save form of the manager
web interface will "break" halfway through, and only the text "Summary"
is visible under the "Saving configuration" header. (This is similar to
what is described in #2197, but with that fixed applied.)

Reference: https://docs.angularjs.org/guide/migration#migrating-from-1-7-to-1-8

make website_documentation WEBSITE_DIR=/var/www/documentation/2.0