Expand integration coverage and fix settings UI

tests/browser/playwright.config.js

@@ -0,0 +1,14 @@
+const { defineConfig } = require('@playwright/test');
+
+module.exports = defineConfig({
+  testDir: '.',
+  testMatch: 'multilang.spec.js',
+  fullyParallel: false,
+  retries: 0,
+  reporter: 'list',
+  use: {
+    baseURL: process.env.JELLYFIN_BASE_URL,
+    screenshot: 'only-on-failure',
+    trace: 'retain-on-failure'
+  }
+});