Implements #6820 Show System metric graphs in Monitor module

interface/web/dashboard/lib/lang/ar_dashlet_metrics.lng

interface/web/dashboard/lib/lang/bg_dashlet_metrics.lng

interface/web/dashboard/lib/lang/br_dashlet_metrics.lng

interface/web/dashboard/lib/lang/ca_dashlet_metrics.lng

interface/web/dashboard/lib/lang/cn_dashlet_metrics.lng

interface/web/dashboard/lib/lang/cz_dashlet_metrics.lng

interface/web/dashboard/lib/lang/de_dashlet_metrics.lng

interface/web/dashboard/lib/lang/dk_dashlet_metrics.lng

interface/web/dashboard/lib/lang/el_dashlet_metrics.lng

interface/web/dashboard/lib/lang/en_dashlet_metrics.lng

interface/web/dashboard/lib/lang/es_dashlet_metrics.lng

interface/web/dashboard/lib/lang/fi_dashlet_metrics.lng

interface/web/dashboard/lib/lang/fr_dashlet_metrics.lng

interface/web/dashboard/lib/lang/hr_dashlet_metrics.lng

interface/web/dashboard/lib/lang/hu_dashlet_metrics.lng

interface/web/dashboard/lib/lang/id_dashlet_metrics.lng

interface/web/dashboard/lib/lang/it_dashlet_metrics.lng

interface/web/dashboard/lib/lang/ja_dashlet_metrics.lng

interface/web/dashboard/lib/lang/nl_dashlet_metrics.lng

interface/web/dashboard/lib/lang/pl_dashlet_metrics.lng