Delete .github/pr-screenshots/menu-translated.png

Screenshots from Playwright tests verifying the fix in menu.tsx and
embedded/index.tsx. Both captured with a 2-second artificial delay on
the language pack endpoint; all UI strings appear in German.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

superset-frontend/src/embedded/index.tsx

@@ -32,6 +32,7 @@ import {
 } from '@apache-superset/core/theme';
 import Switchboard from '@superset-ui/switchboard';
 import getBootstrapData, { applicationRoot } from 'src/utils/getBootstrapData';
+import initPreamble from 'src/preamble';
 import setupClient from 'src/setup/setupClient';
 import setupPlugins from 'src/setup/setupPlugins';
 import { useUiConfig } from 'src/components/UiConfigContext';
@@ -50,8 +51,19 @@ import { embeddedApi } from './api';
 import { getDataMaskChangeTrigger } from './utils';
 import { validateMessageEvent } from './originValidation';
 
-setupPlugins();
-setupCodeOverrides({ embedded: true });
+// Defer plugin setup until after the language pack loads to prevent t() calls in
+// plugin control panel configs from being cached in English before translations are ready.
+const pluginsReady = initPreamble()
+  .catch(err => {
+    logging.warn(
+      'Preamble initialization failed, loading plugins without translations.',
+      err,
+    );
+  })
+  .then(() => {
+    setupPlugins();
+    setupCodeOverrides({ embedded: true });
+  });
 
 const debugMode = process.env.WEBPACK_MODE === 'development';
 const bootstrapData = getBootstrapData();
@@ -172,32 +184,34 @@ function start() {
     method: 'GET',
     endpoint: '/api/v1/me/roles/',
   });
-  return getMeWithRole().then(
-    ({ result }) => {
-      // fill in some missing bootstrap data
-      // (because at pageload, we don't have any auth yet)
-      // this allows the frontend's permissions checks to work.
-      bootstrapData.user = result;
-      store.dispatch({
-        type: USER_LOADED,
-        user: result,
-      });
-      if (!root) {
-        root = createRoot(appMountPoint);
-      }
-      root.render(<EmbeddedApp />);
-    },
-    err => {
-      // something is most likely wrong with the guest token; reset the guard
-      // so a rehandshake with a valid token can retry.
-      logging.error(err);
-      showFailureMessage(
-        t(
-          'Something went wrong with embedded authentication. Check the dev console for details.',
-        ),
-      );
-      started = false;
-    },
+  return pluginsReady.then(() =>
+    getMeWithRole().then(
+      ({ result }) => {
+        // fill in some missing bootstrap data
+        // (because at pageload, we don't have any auth yet)
+        // this allows the frontend's permissions checks to work.
+        bootstrapData.user = result;
+        store.dispatch({
+          type: USER_LOADED,
+          user: result,
+        });
+        if (!root) {
+          root = createRoot(appMountPoint);
+        }
+        root.render(<EmbeddedApp />);
+      },
+      err => {
+        // something is most likely wrong with the guest token; reset the guard
+        // so a rehandshake with a valid token can retry.
+        logging.error(err);
+        showFailureMessage(
+          t(
+            'Something went wrong with embedded authentication. Check the dev console for details.',
+          ),
+        );
+        started = false;
+      },
+    ),
   );
 }
 

superset-frontend/src/views/menu.tsx

@@ -31,6 +31,7 @@ import { ThemeProvider } from '@apache-superset/core/theme';
 import { theme } from '@apache-superset/core/theme';
 import Menu from 'src/features/home/Menu';
 import getBootstrapData from 'src/utils/getBootstrapData';
+import initPreamble from 'src/preamble';
 import { setupStore } from './store';
 import querystring from 'query-string';
 
@@ -67,5 +68,9 @@ const app = (
 
 const menuMountPoint = document.getElementById('app-menu');
 if (menuMountPoint) {
-  createRoot(menuMountPoint).render(app);
+  initPreamble()
+    .catch(() => {}) // preamble logs failures internally; always render the menu
+    .then(() => {
+      createRoot(menuMountPoint).render(app);
+    });
 }