MFde: Resync the "security section" of the website

de/htdocs/security/Makefile include new files
de/htdocs/security/charter.xml updated
de/htdocs/security/reporting.xml new translation
de/htdocs/security/security.xml updated
de/htdocs/security/unsupported.xml new translation
de/share/xml/header.l10n.ent link to german versions
de/share/xml/navibar.l10n.ent link to german versions

Obtained from: The FreeBSD German Documentation Project