test(e2e): click locale switcher by aria-label

Use the actual accessible name of the DE button to ensure Playwright clicks the correct element.

Co-authored-by: dennis <dennis@konkol.net>

e2e/i18n.spec.ts

@@ -4,8 +4,8 @@ test.describe("i18n routing", () => {
   test("language switcher navigates between locales", async ({ page }) => {
     await page.goto("/en", { waitUntil: "domcontentloaded" });
 
-    // Buttons are "EN"/"DE" in the header
-    const deButton = page.getByRole("button", { name: "DE" });
+    // Buttons have aria-labels; click the DE switcher.
+    const deButton = page.getByRole("button", { name: "Sprache auf Deutsch umstellen" });
     if (await deButton.count()) {
       // Verify an EN label is present before switching (nav.home)
       await expect(page.getByRole("link", { name: "Home" })).toBeVisible();