I18n build mode (#3051)

Add build mode option to bundle english translation with UI

invokeai/frontend/web/src/i18n.ts

@@ -1,22 +1,38 @@
 import i18n from 'i18next';
 import LanguageDetector from 'i18next-browser-languagedetector';
 import Backend from 'i18next-http-backend';
-
 import { initReactI18next } from 'react-i18next';
-i18n
-  .use(Backend)
-  .use(LanguageDetector)
-  .use(initReactI18next)
-  .init({
-    fallbackLng: 'en',
-    debug: false,
-    backend: {
-      loadPath: '/locales/{{lng}}.json',
+
+import translationEN from '../dist/locales/en.json';
+
+if (import.meta.env.MODE === 'package') {
+  i18n.use(initReactI18next).init({
+    lng: 'en',
+    resources: {
+      en: { translation: translationEN },
     },
+    debug: false,
     interpolation: {
       escapeValue: false,
     },
     returnNull: false,
   });
+} else {
+  i18n
+    .use(Backend)
+    .use(LanguageDetector)
+    .use(initReactI18next)
+    .init({
+      fallbackLng: 'en',
+      debug: false,
+      backend: {
+        loadPath: '/locales/{{lng}}.json',
+      },
+      interpolation: {
+        escapeValue: false,
+      },
+      returnNull: false,
+    });
+}
 
 export default i18n;