✅(e2e) adapt tests to impress app

Adapt e2e test to works with Impress.

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

@@ -0,0 +1,29 @@
+import { expect, test } from '@playwright/test';
+
+import { keyCloakSignIn } from './common';
+
+test.beforeEach(async ({ page, browserName }) => {
+  await page.goto('/');
+  await keyCloakSignIn(page, browserName);
+});
+
+test.describe('Language', () => {
+  test('checks the language picker', async ({ page }) => {
+    await expect(
+      page.getByRole('button', {
+        name: 'Create a new pad',
+      }),
+    ).toBeVisible();
+
+    const header = page.locator('header').first();
+    await header.getByRole('combobox').getByText('EN').click();
+    await header.getByRole('option', { name: 'FR' }).click();
+    await expect(header.getByRole('combobox').getByText('FR')).toBeVisible();
+
+    await expect(
+      page.getByRole('button', {
+        name: 'Créer un nouveau pad',
+      }),
+    ).toBeVisible();
+  });
+});