feat(core): implement translation

src/app/core/config/translation-init.ts

@@ -0,0 +1,22 @@
+import { inject } from '@angular/core';
+import { TranslateService } from '@ngx-translate/core';
+
+export function initializeTranslations() {
+    const translate = inject(TranslateService);
+
+    const availableLangs = ['de', 'at', 'en'];
+    translate.addLangs(availableLangs);
+
+    const defaultLang = 'de';
+    let langToUse = translate.getBrowserLang() ?? defaultLang;
+    langToUse = availableLangs.includes(langToUse) ? langToUse : defaultLang;
+
+    translate.setFallbackLang(defaultLang);
+    translate.use(langToUse);
+
+    document.documentElement.lang = langToUse;
+    
+    translate.onLangChange.subscribe((event) => {
+      document.documentElement.lang = event.lang;
+    });
+}