Adding waiting for changing language

frontend/testing/playwright/tests/logout-and-invalid-login-only/logout-and-invalid-login-only.spec.ts

@@ -40,6 +40,7 @@ test('That it is not possible to login with invalid credentials', async ({
     await loginPage.clickOnLanguageMenu();
     await loginPage.clickOnNorwegianLanguageOption();
 
+    // Changing langauge happens too fast in the browser, so we need to add some waiting
     await loginPage.waitForXAmountOfMilliseconds(2000);
 
     const langAfterchange = await loginPage.getLanguage();