added node-sass module

frontend/SiteStatus/package.json

     "@ngx-translate/http-loader": "^3.0.1",
     "angular-busy2": "^7.0.0",
     "core-js": "^2.5.4",
+    "node-sass": "^4.11.0",
     "rxjs": "^6.0.0",
     "zone.js": "~0.8.26"
   },