feat: add e2e test for display language patch

This tests loading code-server in Spanish using the `--locale` flag.

Author: jsjoeio

test/e2e/displayLang.test.ts

@@ -0,0 +1,14 @@
+import * as path from "path"
+import { describe, test, expect } from "./baseFixture"
+
+// Given a code-server environment with Spanish Language Pack extension installed
+// and a languagepacks.json in the data-dir
+describe("--locale es", ["--extensions-dir", path.join(__dirname, "./extensions"), "--locale", "es"], {}, () => {
+  test("should load code-server in Spanish", async ({ codeServerPage }) => {
+    // When
+    const visible = await codeServerPage.page.isVisible("text=Explorador")
+
+    // Then
+    expect(visible).toBe(true)
+  })
+})