(ipsec, legacy) add ipsec (mobile) leases to diag and widget, rename "ipsec list_status" to "ipsec list status", closes https://github.com/opnsense/core/issues/139

(legacy/ipsec) add "Connection method" to phase1 settings, closing https://github.com/opnsense/core/issues/477

(legacy/ipsec) fixes for certref, caref, trust config data instead of reengineering authentication_method again...

DHCP: change column of lease table from "Online" to "Status"

fix for #504

(legacy) refactor status_graph.php, consolidate ifstats.php and bandwidth_by_ip.php into legacy_traffic_stats.php, leave graph.php as it is for now (although replacing should be a good idea)

Translation