🤡(e2e) mock PATCH language switch

We add some flaky tests because the aria label
selectors were not everytime in english language.
It was because the language switch was not mocked
in the e2e tests, impacting the consistency of
other concurrent tests.
We mock the language switch in the e2e tests
to ensure that the other tests are not impacted
by the language switch.

src/frontend/apps/e2e/__tests__/app-impress/language.spec.ts

@@ -1,26 +1,10 @@
-import { Page, expect, test } from '@playwright/test';
+import { expect, test } from '@playwright/test';
 
 import { TestLanguage, createDoc, waitForLanguageSwitch } from './utils-common';
 
-test.describe.serial('Language', () => {
-  let page: Page;
-
-  test.beforeAll(async ({ browser }) => {
-    page = await browser.newPage();
-  });
-
-  test.afterAll(async () => {
-    await page.close();
-  });
-
+test.describe('Language', () => {
   test.beforeEach(async ({ page }) => {
     await page.goto('/');
-    await waitForLanguageSwitch(page, TestLanguage.English);
-  });
-
-  test.afterEach(async ({ page }) => {
-    // Switch back to English - important for other tests to run as expected
-    await waitForLanguageSwitch(page, TestLanguage.English);
   });
 
   test('checks language switching', async ({ page }) => {