Add currency preference to dashboard

frontend/src/app/components/fiat-selector/fiat-selector.component.html

@@ -0,0 +1,5 @@
+<div [formGroup]="fiatForm" class="text-small text-center">
+    <select formControlName="fiat" class="custom-select custom-select-sm form-control-secondary form-control mx-auto" style="width: 180px;" (change)="changeFiat()">
+        <option *ngFor="let currency of currencyList" [value]="currency">{{ currencies[currency].name }}</option>
+    </select>
+</div>