diff --git a/frontend/app/framework/angular/title.component.spec.ts b/frontend/app/framework/angular/title.component.spec.ts
index 724a3a3a6..178ace3f8 100644
--- a/frontend/app/framework/angular/title.component.spec.ts
+++ b/frontend/app/framework/angular/title.component.spec.ts
@@ -22,6 +22,8 @@ describe('TitleComponent', () => {
     it('should set title in service', () => {
         titleComponent.message = 'title1';
 
+        expect().nothing();
+
         titleService.verify(x => x.push('title1', undefined), Times.once());
     });
 
@@ -29,6 +31,8 @@ describe('TitleComponent', () => {
         titleComponent.message = 'title1';
         titleComponent.message = 'title2';
 
+        expect().nothing();
+
         titleService.verify(x => x.push('title2', 'title1'), Times.once());
     });
 
@@ -36,6 +40,8 @@ describe('TitleComponent', () => {
         titleComponent.message = 'title1';
         titleComponent.ngOnDestroy();
 
+        expect().nothing();
+
         titleService.verify(x => x.pop(), Times.once());
     });
 
@@ -43,6 +49,8 @@ describe('TitleComponent', () => {
         titleComponent.message = undefined!;
         titleComponent.ngOnDestroy();
 
+        expect().nothing();
+
         titleService.verify(x => x.pop(), Times.never());
     });
 });
\ No newline at end of file
diff --git a/frontend/package-lock.json b/frontend/package-lock.json
index 6e47fa6bb..6b77f88da 100644
--- a/frontend/package-lock.json
+++ b/frontend/package-lock.json
@@ -713,30 +713,12 @@
         "@types/tern": "*"
       }
     },
-    "@types/component-emitter": {
-      "version": "1.2.10",
-      "resolved": "https://registry.npmjs.org/@types/component-emitter/-/component-emitter-1.2.10.tgz",
-      "integrity": "sha512-bsjleuRKWmGqajMerkzox19aGbscQX5rmmvvXl3wlIp5gMG1HgkiwPxsN5p070fBDKTNSPgojVbuY1+HWMbFhg==",
-      "dev": true
-    },
-    "@types/cookie": {
-      "version": "0.4.0",
-      "resolved": "https://registry.npmjs.org/@types/cookie/-/cookie-0.4.0.tgz",
-      "integrity": "sha512-y7mImlc/rNkvCRmg8gC3/lj87S7pTUIJ6QGjwHR9WQJcFs+ZMTOaoPrkdFA/YdbuqVEmEbb5RdhVxMkAcgOnpg==",
-      "dev": true
-    },
     "@types/core-js": {
       "version": "2.5.4",
       "resolved": "https://registry.npmjs.org/@types/core-js/-/core-js-2.5.4.tgz",
       "integrity": "sha512-Xwy8o12ak+iYgFr/KCVaVK5Sy+jFMiiPAID3+ObvMlBzy26XQJw5xu+a6rlHsrJENXj/AwJOGsJpVohUjAzSKQ==",
       "dev": true
     },
-    "@types/cors": {
-      "version": "2.8.10",
-      "resolved": "https://registry.npmjs.org/@types/cors/-/cors-2.8.10.tgz",
-      "integrity": "sha512-C7srjHiVG3Ey1nR6d511dtDkCEjxuN9W1HWAEjGq8kpcwmNM6JJkpC0xvabM7BXTG2wDq8Eu33iH9aQKa7IvLQ==",
-      "dev": true
-    },
     "@types/estree": {
       "version": "0.0.47",
       "resolved": "https://registry.npmjs.org/@types/estree/-/estree-0.0.47.tgz",
@@ -1301,6 +1283,12 @@
         }
       }
     },
+    "after": {
+      "version": "0.8.2",
+      "resolved": "https://registry.npmjs.org/after/-/after-0.8.2.tgz",
+      "integrity": "sha1-/ts5T58OAqqXaOcCvaI7UF+ufh8=",
+      "dev": true
+    },
     "aggregate-error": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/aggregate-error/-/aggregate-error-3.1.0.tgz",
@@ -1500,6 +1488,12 @@
       "integrity": "sha1-qJS3XUvE9s1nnvMkSp/Y9Gri1Cg=",
       "dev": true
     },
+    "arraybuffer.slice": {
+      "version": "0.0.7",
+      "resolved": "https://registry.npmjs.org/arraybuffer.slice/-/arraybuffer.slice-0.0.7.tgz",
+      "integrity": "sha512-wGUIVQXuehL5TCqQun8OW81jGzAWycqzFF8lFp+GOM5BXLYj3bKNsYC4daB7n6XjCqxQA/qgTJ+8ANR3acjrog==",
+      "dev": true
+    },
     "asn1": {
       "version": "0.2.4",
       "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.4.tgz",
@@ -1886,6 +1880,12 @@
       "integrity": "sha512-q/UEjfGJ2Cm3oKV71DJz9d25TPnq5rhBVL2Q4fA5wcC3jcrdn7+SssEybFIxwAvvP+YCsCYNKughoF33GxgycQ==",
       "dev": true
     },
+    "backo2": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/backo2/-/backo2-1.0.2.tgz",
+      "integrity": "sha1-MasayLEpNjRj41s+u2n038+6eUc=",
+      "dev": true
+    },
     "balanced-match": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
@@ -2009,6 +2009,12 @@
       "integrity": "sha512-1Yj8h9Q+QDF5FzhMs/c9+6UntbD5MkRfRwac8DoEm9ZfUBZ7tZ55YcGVAzEe4bXsdQHEk+s9S5wsOKVdZrw0tQ==",
       "dev": true
     },
+    "blob": {
+      "version": "0.0.5",
+      "resolved": "https://registry.npmjs.org/blob/-/blob-0.0.5.tgz",
+      "integrity": "sha512-gaqbzQPqOoamawKg0LGVd7SzLgXS+JH61oWprSLH+P+abTczqJbhTR8CmJ2u9/bUYNmHTGJx/UEmn6doAvvuig==",
+      "dev": true
+    },
     "bluebird": {
       "version": "3.7.2",
       "resolved": "https://registry.npmjs.org/bluebird/-/bluebird-3.7.2.tgz",
@@ -2820,12 +2826,24 @@
       "integrity": "sha1-3dgA2gxmEnOTzKWVDqloo6rxJTs=",
       "dev": true
     },
+    "component-bind": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/component-bind/-/component-bind-1.0.0.tgz",
+      "integrity": "sha1-AMYIq33Nk4l8AAllGx06jh5zu9E=",
+      "dev": true
+    },
     "component-emitter": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/component-emitter/-/component-emitter-1.2.1.tgz",
       "integrity": "sha1-E3kY1teCg/ffemt8WmPhQOaUJeY=",
       "dev": true
     },
+    "component-inherit": {
+      "version": "0.0.3",
+      "resolved": "https://registry.npmjs.org/component-inherit/-/component-inherit-0.0.3.tgz",
+      "integrity": "sha1-ZF/ErfWLcrZJ1crmUTVhnbJv8UM=",
+      "dev": true
+    },
     "compressible": {
       "version": "2.0.18",
       "resolved": "https://registry.npmjs.org/compressible/-/compressible-2.0.18.tgz",
@@ -3081,16 +3099,6 @@
       "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac=",
       "dev": true
     },
-    "cors": {
-      "version": "2.8.5",
-      "resolved": "https://registry.npmjs.org/cors/-/cors-2.8.5.tgz",
-      "integrity": "sha512-KIHbLJqu73RGr/hnbrO9uBeixNGuvSQjul/jdFvS/KFSIH1hWVd1ng7zOHx+YrEfInLG7q4n6GHQ9cDtxv/P6g==",
-      "dev": true,
-      "requires": {
-        "object-assign": "^4",
-        "vary": "^1"
-      }
-    },
     "cosmiconfig": {
       "version": "7.0.0",
       "resolved": "https://registry.npmjs.org/cosmiconfig/-/cosmiconfig-7.0.0.tgz",
@@ -4251,38 +4259,83 @@
       }
     },
     "engine.io": {
-      "version": "4.1.1",
-      "resolved": "https://registry.npmjs.org/engine.io/-/engine.io-4.1.1.tgz",
-      "integrity": "sha512-t2E9wLlssQjGw0nluF6aYyfX8LwYU8Jj0xct+pAhfWfv/YrBn6TSNtEYsgxHIfaMqfrLx07czcMg9bMN6di+3w==",
+      "version": "3.5.0",
+      "resolved": "https://registry.npmjs.org/engine.io/-/engine.io-3.5.0.tgz",
+      "integrity": "sha512-21HlvPUKaitDGE4GXNtQ7PLP0Sz4aWLddMPw2VTyFz1FVZqu/kZsJUO8WNpKuE/OCL7nkfRaOui2ZCJloGznGA==",
       "dev": true,
       "requires": {
         "accepts": "~1.3.4",
         "base64id": "2.0.0",
         "cookie": "~0.4.1",
-        "cors": "~2.8.5",
-        "debug": "~4.3.1",
-        "engine.io-parser": "~4.0.0",
+        "debug": "~4.1.0",
+        "engine.io-parser": "~2.2.0",
         "ws": "~7.4.2"
       },
       "dependencies": {
         "debug": {
-          "version": "4.3.1",
-          "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.1.tgz",
-          "integrity": "sha512-doEwdvm4PCeK4K3RQN2ZC2BYUBaxwLARCqZmMjtF8a51J2Rb0xpVloFRnCODwqjpwnAoao4pelN8l3RJdv3gRQ==",
+          "version": "4.1.1",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.1.1.tgz",
+          "integrity": "sha512-pYAIzeRo8J6KPEaJ0VWOh5Pzkbw/RetuzehGM7QRRX5he4fPHx2rdKMB256ehJCkX+XRQm16eZLqLNS8RSZXZw==",
+          "dev": true,
+          "requires": {
+            "ms": "^2.1.1"
+          }
+        }
+      }
+    },
+    "engine.io-client": {
+      "version": "3.5.2",
+      "resolved": "https://registry.npmjs.org/engine.io-client/-/engine.io-client-3.5.2.tgz",
+      "integrity": "sha512-QEqIp+gJ/kMHeUun7f5Vv3bteRHppHH/FMBQX/esFj/fuYfjyUKWGMo3VCvIP/V8bE9KcjHmRZrhIz2Z9oNsDA==",
+      "dev": true,
+      "requires": {
+        "component-emitter": "~1.3.0",
+        "component-inherit": "0.0.3",
+        "debug": "~3.1.0",
+        "engine.io-parser": "~2.2.0",
+        "has-cors": "1.1.0",
+        "indexof": "0.0.1",
+        "parseqs": "0.0.6",
+        "parseuri": "0.0.6",
+        "ws": "~7.4.2",
+        "xmlhttprequest-ssl": "~1.6.2",
+        "yeast": "0.1.2"
+      },
+      "dependencies": {
+        "component-emitter": {
+          "version": "1.3.0",
+          "resolved": "https://registry.npmjs.org/component-emitter/-/component-emitter-1.3.0.tgz",
+          "integrity": "sha512-Rd3se6QB+sO1TwqZjscQrurpEPIfO0/yYnSin6Q/rD3mOutHvUrCAhJub3r90uNb+SESBuE0QYoB90YdfatsRg==",
+          "dev": true
+        },
+        "debug": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-3.1.0.tgz",
+          "integrity": "sha512-OX8XqP7/1a9cqkxYw2yXss15f26NKWBpDXQd0/uK/KPqdQhxbPa994hnzjcE2VqQpDslf55723cKPUOGSmMY3g==",
           "dev": true,
           "requires": {
-            "ms": "2.1.2"
+            "ms": "2.0.0"
           }
+        },
+        "ms": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
+          "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g=",
+          "dev": true
         }
       }
     },
     "engine.io-parser": {
-      "version": "4.0.2",
-      "resolved": "https://registry.npmjs.org/engine.io-parser/-/engine.io-parser-4.0.2.tgz",
-      "integrity": "sha512-sHfEQv6nmtJrq6TKuIz5kyEKH/qSdK56H/A+7DnAuUPWosnIZAS2NHNcPLmyjtY3cGS/MqJdZbUjW97JU72iYg==",
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/engine.io-parser/-/engine.io-parser-2.2.1.tgz",
+      "integrity": "sha512-x+dN/fBH8Ro8TFwJ+rkB2AmuVw9Yu2mockR/p3W8f8YtExwFgDvBDi0GWyb4ZLkpahtDGZgtr3zLovanJghPqg==",
       "dev": true,
       "requires": {
-        "base64-arraybuffer": "0.1.4"
+        "after": "0.8.2",
+        "arraybuffer.slice": "~0.0.7",
+        "base64-arraybuffer": "0.1.4",
+        "blob": "0.0.5",
+        "has-binary2": "~1.0.2"
       }
     },
     "enhanced-resolve": {
@@ -5834,6 +5887,29 @@
       "integrity": "sha512-LSBS2LjbNBTf6287JEbEzvJgftkF5qFkmCo9hDRpAzKhUOlJ+hx8dd4USs00SgsUNwc4617J9ki5YtEClM2ffA==",
       "dev": true
     },
+    "has-binary2": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/has-binary2/-/has-binary2-1.0.3.tgz",
+      "integrity": "sha512-G1LWKhDSvhGeAQ8mPVQlqNcOB2sJdwATtZKl2pDKKHfpf/rYj24lkinxf69blJbnsvtqqNU+L3SL50vzZhXOnw==",
+      "dev": true,
+      "requires": {
+        "isarray": "2.0.1"
+      },
+      "dependencies": {
+        "isarray": {
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/isarray/-/isarray-2.0.1.tgz",
+          "integrity": "sha1-o32U7ZzaLVmGXJ92/llu4fM4dB4=",
+          "dev": true
+        }
+      }
+    },
+    "has-cors": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/has-cors/-/has-cors-1.1.0.tgz",
+      "integrity": "sha1-XkdHk/fqmEPRu5nCPu9J/xJv/zk=",
+      "dev": true
+    },
     "has-flag": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-3.0.0.tgz",
@@ -6509,6 +6585,12 @@
       "integrity": "sha1-8w9xbI4r00bHtn0985FVZqfAVgc=",
       "dev": true
     },
+    "indexof": {
+      "version": "0.0.1",
+      "resolved": "https://registry.npmjs.org/indexof/-/indexof-0.0.1.tgz",
+      "integrity": "sha1-gtwzbSMrkGIXnQWrMpOmYFn9Q10=",
+      "dev": true
+    },
     "individual": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/individual/-/individual-2.0.0.tgz",
@@ -7010,9 +7092,9 @@
       "dev": true
     },
     "isbinaryfile": {
-      "version": "4.0.6",
-      "resolved": "https://registry.npmjs.org/isbinaryfile/-/isbinaryfile-4.0.6.tgz",
-      "integrity": "sha512-ORrEy+SNVqUhrCaal4hA4fBzhggQQ+BaLntyPOdoEiwlKZW9BZiJXjg3RMiruE4tPEI3pyVPpySHQF/dKWperg==",
+      "version": "4.0.8",
+      "resolved": "https://registry.npmjs.org/isbinaryfile/-/isbinaryfile-4.0.8.tgz",
+      "integrity": "sha512-53h6XFniq77YdW+spoRrebh0mnmTxRPTlcuIArO57lmMdq4uBKFKaeTjnb92oYWrSn/LVL+LT+Hap2tFQj8V+w==",
       "dev": true
     },
     "isexe": {
@@ -7229,9 +7311,9 @@
       }
     },
     "jasmine-core": {
-      "version": "3.7.1",
-      "resolved": "https://registry.npmjs.org/jasmine-core/-/jasmine-core-3.7.1.tgz",
-      "integrity": "sha512-DH3oYDS/AUvvr22+xUBW62m1Xoy7tUlY1tsxKEJvl5JeJ7q8zd1K5bUwiOxdH+erj6l2vAMM3hV25Xs9/WrmuQ==",
+      "version": "3.6.0",
+      "resolved": "https://registry.npmjs.org/jasmine-core/-/jasmine-core-3.6.0.tgz",
+      "integrity": "sha512-8uQYa7zJN8hq9z+g8z1bqCfdC8eoDAeVnM5sfqs7KHv9/ifoJ500m018fpFc7RDaO6SWCLCXwo/wPSNcdYTgcw==",
       "dev": true
     },
     "jest-worker": {
@@ -7381,9 +7463,9 @@
       }
     },
     "karma": {
-      "version": "6.3.2",
-      "resolved": "https://registry.npmjs.org/karma/-/karma-6.3.2.tgz",
-      "integrity": "sha512-fo4Wt0S99/8vylZMxNj4cBFyOBBnC1bewZ0QOlePij/2SZVWxqbyLeIddY13q6URa2EpLRW8ixvFRUMjkmo1bw==",
+      "version": "5.2.3",
+      "resolved": "https://registry.npmjs.org/karma/-/karma-5.2.3.tgz",
+      "integrity": "sha512-tHdyFADhVVPBorIKCX8A37iLHxc6RBRphkSoQ+MLKdAtFn1k97tD8WUGi1KlEtDZKL3hui0qhsY9HXUfSNDYPQ==",
       "dev": true,
       "requires": {
         "body-parser": "^1.19.0",
@@ -7404,11 +7486,11 @@
         "qjobs": "^1.2.0",
         "range-parser": "^1.2.1",
         "rimraf": "^3.0.2",
-        "socket.io": "^3.1.0",
+        "socket.io": "^2.3.0",
         "source-map": "^0.6.1",
         "tmp": "0.2.1",
-        "ua-parser-js": "^0.7.23",
-        "yargs": "^16.1.1"
+        "ua-parser-js": "0.7.22",
+        "yargs": "^15.3.1"
       },
       "dependencies": {
         "glob": {
@@ -7430,6 +7512,25 @@
           "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
           "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
           "dev": true
+        },
+        "yargs": {
+          "version": "15.4.1",
+          "resolved": "https://registry.npmjs.org/yargs/-/yargs-15.4.1.tgz",
+          "integrity": "sha512-aePbxDmcYW++PaqBsJ+HYUFwCdv4LVvdnhBy78E57PIor8/OVvhMrADFFEDh8DHDFRv/O9i3lPhsENjO7QX0+A==",
+          "dev": true,
+          "requires": {
+            "cliui": "^6.0.0",
+            "decamelize": "^1.2.0",
+            "find-up": "^4.1.0",
+            "get-caller-file": "^2.0.1",
+            "require-directory": "^2.1.1",
+            "require-main-filename": "^2.0.0",
+            "set-blocking": "^2.0.0",
+            "string-width": "^4.2.0",
+            "which-module": "^2.0.0",
+            "y18n": "^4.0.0",
+            "yargs-parser": "^18.1.2"
+          }
         }
       }
     },
@@ -9903,6 +10004,18 @@
       "integrity": "sha512-ugq4DFI0Ptb+WWjAdOK16+u/nHfiIrcE+sh8kZMaM0WllQKLI9rOUq6c2b7cwPkXdzfQESqvoqK6ug7U/Yyzug==",
       "optional": true
     },
+    "parseqs": {
+      "version": "0.0.6",
+      "resolved": "https://registry.npmjs.org/parseqs/-/parseqs-0.0.6.tgz",
+      "integrity": "sha512-jeAGzMDbfSHHA091hr0r31eYfTig+29g3GKKE/PPbEQ65X0lmMwlEoqmhzu0iztID5uJpZsFlUPDP8ThPL7M8w==",
+      "dev": true
+    },
+    "parseuri": {
+      "version": "0.0.6",
+      "resolved": "https://registry.npmjs.org/parseuri/-/parseuri-0.0.6.tgz",
+      "integrity": "sha512-AUjen8sAkGgao7UyCX6Ahv0gIK2fABKmYjvP4xmy5JaKvcbTRueIqIPHLAfq30xJddqSE033IOMUSOMCcK3Sow==",
+      "dev": true
+    },
     "parseurl": {
       "version": "1.3.3",
       "resolved": "https://registry.npmjs.org/parseurl/-/parseurl-1.3.3.tgz",
@@ -13406,48 +13519,53 @@
       }
     },
     "socket.io": {
-      "version": "3.1.2",
-      "resolved": "https://registry.npmjs.org/socket.io/-/socket.io-3.1.2.tgz",
-      "integrity": "sha512-JubKZnTQ4Z8G4IZWtaAZSiRP3I/inpy8c/Bsx2jrwGrTbKeVU5xd6qkKMHpChYeM3dWZSO0QACiGK+obhBNwYw==",
+      "version": "2.4.1",
+      "resolved": "https://registry.npmjs.org/socket.io/-/socket.io-2.4.1.tgz",
+      "integrity": "sha512-Si18v0mMXGAqLqCVpTxBa8MGqriHGQh8ccEOhmsmNS3thNCGBwO8WGrwMibANsWtQQ5NStdZwHqZR3naJVFc3w==",
       "dev": true,
       "requires": {
-        "@types/cookie": "^0.4.0",
-        "@types/cors": "^2.8.8",
-        "@types/node": ">=10.0.0",
-        "accepts": "~1.3.4",
-        "base64id": "~2.0.0",
-        "debug": "~4.3.1",
-        "engine.io": "~4.1.0",
-        "socket.io-adapter": "~2.1.0",
-        "socket.io-parser": "~4.0.3"
+        "debug": "~4.1.0",
+        "engine.io": "~3.5.0",
+        "has-binary2": "~1.0.2",
+        "socket.io-adapter": "~1.1.0",
+        "socket.io-client": "2.4.0",
+        "socket.io-parser": "~3.4.0"
       },
       "dependencies": {
         "debug": {
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@@ -14200,6 +14369,12 @@
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+      "integrity": "sha1-F+bBH3PdTz10zaek/zI46a2b+JA=",
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+      "resolved": "https://registry.npmjs.org/xmlhttprequest-ssl/-/xmlhttprequest-ssl-1.6.2.tgz",
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@@ -16671,6 +16852,12 @@
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+      "resolved": "https://registry.npmjs.org/yeast/-/yeast-0.1.2.tgz",
+      "integrity": "sha1-AI4G2AlDIMNy28L47XagymyKxBk=",
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diff --git a/frontend/package.json b/frontend/package.json
index 665cd4839..c7e27f5c1 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -96,8 +96,8 @@
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