make new localstorage function file

src/boot/lang.js

@@ -1,10 +1,10 @@
 import { createI18n } from 'vue-i18n';
 import yaml from 'js-yaml';
+import { getLocalLanguage } from 'src/localstorage/localStorage';
 
 export const lang = [];
 
 const systemLocale = navigator.language || 'en-US';
-const savedLang = localStorage.getItem('lang');
 
 const messages = {};
 const modules = import.meta.glob('src/assets/lang/*.yaml', {
@@ -39,7 +39,7 @@ function resolveLocale(desiredLocale) {
   return messages['en'] ? 'en' : Object.keys(messages)[0];
 }
 
-const selectedLocale = resolveLocale(savedLang || systemLocale);
+const selectedLocale = resolveLocale(getLocalLanguage() || systemLocale);
 
 const i18n = createI18n({
   legacy: false, // Composition API mode