added last downtime log (closes #55)

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

angular.json

@@ -17,12 +17,14 @@
         "build": {
           "builder": "@angular-devkit/build-angular:browser",
           "options": {
+            "allowedCommonJsDependencies": ["dayjs/locale/de"],
             "outputPath": "dist/universal-statuspage/browser",
             "index": "src/index.html",
             "main": "src/main.ts",
             "polyfills": "src/polyfills.ts",
             "tsConfig": "tsconfig.app.json",
             "aot": true,
+            "outputHashing": "media",
             "assets": [
               "src/favicon.png",
               "src/favicon-operational.ico",