feat: add english and hungarian translations

src/app/i18n/translation.service.ts

@@ -0,0 +1,47 @@
+import { Injectable, signal } from '@angular/core';
+import {
+  translations,
+  Language,
+  TranslationKey,
+  TranslationParams
+} from './translations';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class TranslationService {
+  private readonly storageKey = 'language';
+
+  readonly language = signal<Language>(this.getInitialLanguage());
+
+  setLanguage(language: Language): void {
+    this.language.set(language);
+    localStorage.setItem(this.storageKey, language);
+  }
+
+  translate(key: TranslationKey, params: TranslationParams = {}): string {
+    let text: string = translations[this.language()][key];
+
+    for (const [param, value] of Object.entries(params)) {
+      text = text.replaceAll(`{${param}}`, String(value));
+    }
+
+    return text;
+  }
+
+  private getInitialLanguage(): Language {
+    const stored = localStorage.getItem(this.storageKey);
+
+    if (stored && stored in translations) {
+      return stored as Language;
+    }
+
+    const browserLanguage = navigator.language.split('-')[0] as Language;
+
+    if (browserLanguage in translations) {
+      return browserLanguage;
+    }
+
+    return 'en';
+  }
+}