MFde: Resync the info about currently available/supported FreeBSD versions

de/htdocs/index.xsl r47418 -> r49131
de/htdocs/where.xml r47218 -> r49444
de/share/xml/header.l10n.ent r40575 -> r48437
de/share/xml/l10n.ent add rel1
de/share/xml/navibar.l10n.ent r41115 -> r49163

Obtained from: The FreeBSD German Documentation Project