feat(HotelItem): update currency display logic and options

src/app/HotelItem/HotelItem.component.html

@@ -1,9 +1,9 @@
 <p>Name: {{hotel.hotelName}}</p>
 <p>Description: {{hotel.description}}</p>
-<p>Price: {{hotel.price | currency : "EUR" : "symbol" : "2.2-2" : "de-DE"}}</p>
+<p>Price: {{hotel.price | currency : getCurrencyCode(selectedLanguage) : "symbol" : "2.2-2" : selectedLanguage}}</p>
 <select [ngModel]="selectedLanguage" (ngModelChange)="languageChange($event)">
   @for (lang of langs; track lang.lang) {
-    <option value="{{lang.lang}}">{{lang.lang}}</option>
+    <option value="{{lang.code}}" [selected]="lang.lang === 'de'">{{lang.lang}}</option>
   }
 </select>
 <img src="{{hotel.imageUrl}}" alt="Hotel">