feat: implement i18n for product and category, add 5 new locales

apps/spa/src/i18n.ts

@@ -3,6 +3,10 @@ import { initReactI18next } from 'react-i18next'
 
 import enTranslation from './locales/en/translation.json'
 import thTranslation from './locales/th/translation.json'
+import jaTranslation from "./locales/ja/translation.json"
+import zhTranslation from "./locales/zh/translation.json"
+import viTranslation from "./locales/vi/translation.json"
+import koTranslation from "./locales/ko/translation.json"
 
 // Retrieve default lang from localStorage if set
 const savedLang = localStorage.getItem('homaroma_lang') || 'th'
@@ -13,6 +17,10 @@ i18n
     resources: {
       en: { translation: enTranslation },
       th: { translation: thTranslation },
+      ja: { translation: jaTranslation },
+      zh: { translation: zhTranslation },
+      vi: { translation: viTranslation },
+      ko: { translation: koTranslation },
     },
     lng: savedLang, // default language (Thai)
     fallbackLng: 'en',