added last downtime log (closes #55)

added uptime statistics (closes #56)
added german translations (closes #57)

src/assets/i18n/de.json

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+{
+  "state": {
+    "operational": "Funktionsfähig",
+    "maintenance": "Wartung",
+    "outage": "Ausfall"
+  },
+  "uptime": {
+    "title": "Verfügbarkeit",
+    "last24hours": "Letzte 24 Stunden",
+    "last7days": "Letzte 7 Tage",
+    "last30days": "Letzte 30 Tage",
+    "last90days": "Letzte 90 Tage"
+  },
+  "recent-events": {
+    "title": "Letzte Ereignisse",
+    "operational": "Wieder funktionsfähig",
+    "maintenance": "Wartung für {{time}}",
+    "outage": "Ausfall für {{time}}"
+  },
+  "last-updated": "Aktualisiert {{time}}",
+  "loading": "Lade...",
+  "show-all": "Alle anzeigen",
+  "show-less": "Weniger anzeigen"
+}

src/assets/i18n/en.json

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+{
+  "state": {
+    "operational": "Operational",
+    "maintenance": "Maintenance",
+    "outage": "Outage"
+  },
+  "uptime": {
+    "title": "Uptime",
+    "last24hours": "Last 24 hours",
+    "last7days": "Last 7 days",
+    "last30days": "Last 30 days",
+    "last90days": "Last 90 days"
+  },
+  "recent-events": {
+    "title": "Recent events",
+    "operational": "Operational again",
+    "maintenance": "Maintenance for {{time}}",
+    "outage": "Outage for {{time}}"
+  },
+  "last-updated": "Last updated {{time}}",
+  "loading": "Loading...",
+  "show-all": "Show all",
+  "show-less": "Show less"
+}