use IIFE for fiori assets import

Author: Lukas742

packages/main/scripts/generateI18n.mjs

@@ -59,11 +59,13 @@ spawnSync('npx', ['prettier', '--write', path.resolve(SRC_I18N_PROPERTIES, 'i18n
 const jsonImports = await readdir(TARGET_I18N_JSON_IMPORTS);
 
 function createDynamicFioriAssetsImport(suffix) {
-  return `try {
-  await import('@ui5/webcomponents-fiori/dist/Assets${suffix}.js');
-} catch {
-  console.warn("Skipped '@ui5/webcomponents-fiori/dist/Assets${suffix}.js' import!")
-}`;
+  return `(async () => {
+  try {
+    await import('@ui5/webcomponents-fiori/dist/Assets${suffix}.js');
+  } catch {
+    console.warn("Skipped '@ui5/webcomponents-fiori/dist/Assets${suffix}.js' import!");
+  }
+})();`;
 }
 
 const assets = [`import '@ui5/webcomponents/dist/Assets.js';`, createDynamicFioriAssetsImport('')];