Libraries upgrades.

frontend/package.json

@@ -11,28 +11,28 @@
   },
   "private": true,
   "dependencies": {
-    "@angular/animations": "^8.0.0",
-    "@angular/common": "^8.0.0",
-    "@angular/compiler": "^8.0.0",
-    "@angular/core": "^8.0.0",
-    "@angular/forms": "^8.0.0",
-    "@angular/platform-browser": "^8.0.0",
-    "@angular/platform-browser-dynamic": "^8.0.0",
-    "@angular/router": "^8.0.0",
-    "@ng-bootstrap/ng-bootstrap": "^3.3.1",
+    "@angular/animations": "^8.2.11",
+    "@angular/common": "^8.2.11",
+    "@angular/compiler": "^8.2.11",
+    "@angular/core": "^8.2.11",
+    "@angular/forms": "^8.2.11",
+    "@angular/platform-browser": "^8.2.11",
+    "@angular/platform-browser-dynamic": "^8.2.11",
+    "@angular/router": "^8.2.11",
+    "@ng-bootstrap/ng-bootstrap": "^5.1.1",
     "bootstrap": "^4.3.1",
     "chartist": "^0.11.2",
-    "core-js": "^2.6.9",
+    "core-js": "^3.3.3",
     "ng-chartist": "^2.0.0-beta.1",
-    "rxjs": "^6.5.2",
+    "rxjs": "^6.5.3",
     "tslib": "^1.9.0",
-    "zone.js": "~0.9.1"
+    "zone.js": "~0.10.2"
   },
   "devDependencies": {
     "@angular-devkit/build-angular": "~0.800.0",
-    "@angular/cli": "~8.0.2",
-    "@angular/compiler-cli": "^8.0.0",
-    "@angular/language-service": "^8.0.0",
+    "@angular/cli": "~8.3.12",
+    "@angular/compiler-cli": "^8.2.11",
+    "@angular/language-service": "^8.2.11",
     "@types/chartist": "^0.9.46",
     "@types/jasmine": "^2.8.16",
     "@types/jasminewd2": "^2.0.6",

frontend/src/app/shared/shared.module.ts

@@ -10,8 +10,8 @@ import { ChartistComponent } from '../statistics/chartist.component';
 @NgModule({
   imports: [
     CommonModule,
-    NgbButtonsModule.forRoot(),
-    NgbModalModule.forRoot(),
+    NgbButtonsModule,
+    NgbModalModule,
   ],
   declarations: [
     ChartistComponent,

frontend/src/polyfills.ts

@@ -43,7 +43,7 @@
 
 /** Evergreen browsers require these. **/
 // Used for reflect-metadata in JIT. If you use AOT (and only Angular decorators), you can remove.
-import 'core-js/es7/reflect';
+// import 'core-js/es7/reflect';
 
 
 /**