refactor: use lazy loading for localization files

src/localization/index.js

@@ -0,0 +1,37 @@
+const langCodes = [
+    'cs',
+    'en',
+    'es',
+    'fr',
+    'hu',
+    'ja',
+    'ko',
+    'pl',
+    'pt',
+    'ru',
+    'th',
+    'vi',
+    'zh-CN',
+    'zh-TW'
+];
+
+async function getLocalizationStrings() {
+    const urlPromises = Promise.all(
+        langCodes.map((code) =>
+            import(`./${code}.json?url`).then((m) => m.default)
+        )
+    );
+
+    const urls = await urlPromises;
+    const fetchPromises = Promise.all(
+        urls.map((url) => fetch(url).then((res) => res.json()))
+    );
+    const results = await fetchPromises;
+    const entries = langCodes.map((code, index) => {
+        return [code, results[index]];
+    });
+
+    return Object.fromEntries(entries);
+}
+
+export { getLocalizationStrings };