Added UI flow for creating default admin account. Dialog will show up after enabling or in the login menu if the admin account isn't present

src/app/dialogs/set-default-admin-dialog/set-default-admin-dialog.component.html

@@ -0,0 +1,19 @@
+<h4 mat-dialog-title><ng-container i18n="Create admin account dialog title">Create admin account</ng-container></h4>
+
+<mat-dialog-content>
+    <div>
+        <p i18n="No default admin detected explanation">No default admin account detected. This will create and set the password for an admin account with the user name as 'admin'.</p>
+    </div>
+    <div style="position: relative">
+        <div>
+            <mat-form-field color="accent">
+                <input type="password" (keyup.enter)="create()" matInput [(ngModel)]="input" placeholder="Password" placeholder-i18n="Password">
+            </mat-form-field>
+        </div>
+    </div>
+</mat-dialog-content>
+
+<mat-dialog-actions>
+    <button [disabled]="input.length === 0" color="accent" style="margin-bottom: 12px;" (click)="create()" mat-raised-button><ng-container i18n="Create">Create</ng-container></button>
+    <div class="spinner-div"><mat-spinner [diameter]="25" *ngIf="creating"></mat-spinner></div>
+</mat-dialog-actions>

src/app/dialogs/set-default-admin-dialog/set-default-admin-dialog.component.scss

@@ -0,0 +1,5 @@
+.spinner-div {
+    position: relative;
+    left: 10px;
+    bottom: 5px;
+}

src/app/dialogs/set-default-admin-dialog/set-default-admin-dialog.component.spec.ts

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+import { async, ComponentFixture, TestBed } from '@angular/core/testing';
+
+import { SetDefaultAdminDialogComponent } from './set-default-admin-dialog.component';
+
+describe('SetDefaultAdminDialogComponent', () => {
+  let component: SetDefaultAdminDialogComponent;
+  let fixture: ComponentFixture<SetDefaultAdminDialogComponent>;
+
+  beforeEach(async(() => {
+    TestBed.configureTestingModule({
+      declarations: [ SetDefaultAdminDialogComponent ]
+    })
+    .compileComponents();
+  }));
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(SetDefaultAdminDialogComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});

src/app/dialogs/set-default-admin-dialog/set-default-admin-dialog.component.ts

@@ -0,0 +1,33 @@
+import { Component, OnInit } from '@angular/core';
+import { PostsService } from 'app/posts.services';
+import { MatDialogRef } from '@angular/material/dialog';
+
+@Component({
+  selector: 'app-set-default-admin-dialog',
+  templateUrl: './set-default-admin-dialog.component.html',
+  styleUrls: ['./set-default-admin-dialog.component.scss']
+})
+export class SetDefaultAdminDialogComponent implements OnInit {
+  creating = false;
+  input = '';
+  constructor(private postsService: PostsService, public dialogRef: MatDialogRef<SetDefaultAdminDialogComponent>) { }
+
+  ngOnInit(): void {
+  }
+
+  create() {
+    this.creating = true;
+    this.postsService.createAdminAccount(this.input).subscribe(res => {
+      this.creating = false;
+      if (res['success']) {
+        this.dialogRef.close(true);
+      } else {
+        this.dialogRef.close(false);
+      }
+    }, err => {
+      console.log(err);
+      this.dialogRef.close(false);
+    });
+  }
+
+}