Added fiat balance to address and made fiat balance into a component.

frontend/src/app/fiat/fiat.component.html

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+<span class="green-color">{{ (conversions$ | async)?.USD * value / 100000000 | currency:'USD':'symbol':'1.2-2' }}</span>

frontend/src/app/fiat/fiat.component.scss

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+.green-color {
+  color: #3bcc49;
+}

frontend/src/app/fiat/fiat.component.spec.ts

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

frontend/src/app/fiat/fiat.component.ts

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+import { Component, OnInit, ChangeDetectionStrategy, Input } from '@angular/core';
+import { Observable } from 'rxjs';
+import { StateService } from '../services/state.service';
+
+@Component({
+  selector: 'app-fiat',
+  templateUrl: './fiat.component.html',
+  styleUrls: ['./fiat.component.scss'],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+})
+export class FiatComponent implements OnInit {
+  conversions$: Observable<any>;
+
+  @Input() value: number;
+
+  constructor(
+    private stateService: StateService,
+  ) { }
+
+  ngOnInit(): void {
+    this.conversions$ = this.stateService.conversions$.asObservable();
+  }
+
+}