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worklenz-frontend/src/utils/language-utils.ts

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+import { ILanguageType, Language } from '@/features/i18n/localesSlice';
+
+const STORAGE_KEY = 'i18nextLng';
+
+/**
+ * Gets the user's browser language and returns it if supported, otherwise returns English
+ * @returns The detected supported language or English as fallback
+ */
+export const getDefaultLanguage = (): ILanguageType => {
+  const browserLang = navigator.language.split('-')[0];
+  if (Object.values(Language).includes(browserLang as Language)) {
+    return browserLang as ILanguageType;
+  }
+  return Language.EN;
+};
+
+export const DEFAULT_LANGUAGE: ILanguageType = getDefaultLanguage();
+
+/**
+ * Gets the current language from local storage
+ * @returns The stored language or default language if not found
+ */
+export const getLanguageFromLocalStorage = (): ILanguageType => {
+  const savedLng = localStorage.getItem(STORAGE_KEY);
+  if (Object.values(Language).includes(savedLng as Language)) {
+    return savedLng as ILanguageType;
+  }
+  return DEFAULT_LANGUAGE;
+};
+
+/**
+ * Saves the current language to local storage
+ * @param lng Language to save
+ */
+export const saveLanguageInLocalStorage = (lng: ILanguageType): void => {
+  localStorage.setItem(STORAGE_KEY, lng);
+};