이메일 인증 재발송과 관리자 승인 개선

script/page-i18n.js

@@ -2,13 +2,15 @@
  * data-i18n 속성 기반 페이지 번역
  */
 (function initPageI18n() {
+    const SUPPORTED_LANGUAGES = new Set(['ko', 'ja', 'en']);
+
     /**
      * @returns {Promise<string>}
      */
     function getLang() {
         const fromQuery = new URLSearchParams(window.location.search).get('lang');
-        if (fromQuery) return fromQuery;
-        return localStorage.getItem('lang') || 'ko';
+        const selected = fromQuery || localStorage.getItem('lang') || 'ko';
+        return SUPPORTED_LANGUAGES.has(selected) ? selected : 'ko';
     }
 
     /**
@@ -59,6 +61,7 @@
 
     async function applyPageI18n() {
         const lang = await getLang();
+        document.documentElement.lang = lang;
         cachedTranslations = await loadTranslations(lang);
         applyTranslations(cachedTranslations);
         return cachedTranslations;