feat(i18n): localize zh-TW messages to Taiwan terms and show native language names (#1279)

## Summary

Use Taiwan-prefered language across the `zh-TW.json` message catalog, and updates language labels in all locale files to display each language in its native script.

### zh-TW localization (commit a502892)

Roughly 460 replacements across ~100 term pairs in `frontend/messages/zh-TW.json`:

- 消息→訊息, 用戶→使用者, 加載→載入, 搜索→搜尋
- 緩存→快取, 默認→預設, 數據→資料, 質量→品質
- 代碼→程式碼, 連接→連線, 斷開→中斷, 遠程→遠端
- 令牌→權杖, 創建→建立, 項目→專案, 打開→開啟
- 運行→執行, 導出→匯出, 導入→匯入, 文件→檔案
- 周期→週期, 周一~周日→週一~週日
- 恢復→還原 (trash) / 繼續 (session resume)
- 訪問→存取, 設置→設定, 字符→字元, 接口→介面, etc.

Some references (in zh-TW)
- https://hackmd.io/@l10n-tw/glossaries
- https://zh.wikibooks.org/zh-tw/%E5%A4%A7%E9%99%86%E5%8F%B0%E6%B9%BE%E8%AE%A1%E7%AE%97%E6%9C%BA%E6%9C%AF%E8%AF%AD%E5%AF%B9%E7%85%A7%E8%A1%A8

### Language label changes (commits 3a1fb97, 7e231e6)

- `en.json`, `fr.json`, `ko.json`, `zh-CN.json`: language names now shown in their native script (简体中文, 繁體中文, 한국어, Français, English) instead of translated descriptions
- `LanguageSettings.svelte`: added a globe emoji (🌐) prefix to the language setting label for better visibility

Co-authored-by: BoX Fan <coffee0127@users.noreply.github.com>

Author: coffee0127

frontend/e2e/virtual-list.spec.ts

@@ -64,8 +64,7 @@ test.describe("Virtual list behavior", () => {
     });
 
     sp = new SessionsPage(page);
-    await page.goto("/");
-    await expect(sp.sessionItems.first()).toBeVisible();
+    await sp.goto();
   });
 
   test("renders end of list when scrolling down", async () => {
@@ -85,6 +84,17 @@ test.describe("Virtual list behavior", () => {
       .poll(() => getScrollTop(sp.sessionListScroll))
       .toBeGreaterThan(0);
 
+    // Scrolling starts best-effort hydration for the newly visible rows.
+    // Wait for those observable labels to settle before opening the
+    // typeahead so late row updates cannot steal focus in WebKit.
+    await expect
+      .poll(async () => {
+        const labels = await sp.sessionItems.allTextContents();
+        return labels.length > 0 &&
+          labels.every((label) => label.includes("Hello from session"));
+      }, { timeout: 15_000 })
+      .toBe(true);
+
     await sp.filterByProject("tiny");
 
     // Wait for filtered results to render before checking

frontend/messages/en.json

@@ -895,10 +895,10 @@
   "settings_language_description": "Choose the interface language.",
   "settings_language_label": "Interface language",
   "settings_language_english": "English",
-  "settings_language_simplified_chinese": "Simplified Chinese",
-  "settings_language_traditional_chinese": "Traditional Chinese",
-  "settings_language_korean": "Korean",
-  "settings_language_french": "French",
+  "settings_language_simplified_chinese": "简体中文",
+  "settings_language_traditional_chinese": "繁體中文",
+  "settings_language_korean": "한국어",
+  "settings_language_french": "Français",
   "settings_language_no_results": "No languages found",
   "nav_recent_edits": "Recent Edits",
   "recent_edits_title": "Recent Edits",

frontend/messages/fr.json

@@ -894,10 +894,10 @@
   "settings_language_title": "Langue",
   "settings_language_description": "Choisissez la langue de l'interface.",
   "settings_language_label": "Langue de l'interface",
-  "settings_language_english": "Anglais",
-  "settings_language_simplified_chinese": "Chinois simplifié",
-  "settings_language_traditional_chinese": "Chinois traditionnel",
-  "settings_language_korean": "Coréen",
+  "settings_language_english": "English",
+  "settings_language_simplified_chinese": "简体中文",
+  "settings_language_traditional_chinese": "繁體中文",
+  "settings_language_korean": "한국어",
   "settings_language_french": "Français",
   "settings_language_no_results": "Aucune langue trouvée",
   "nav_recent_edits": "Modifications récentes",

frontend/messages/ko.json

@@ -869,11 +869,11 @@
   "settings_language_title": "언어",
   "settings_language_description": "인터페이스 언어를 선택하세요.",
   "settings_language_label": "인터페이스 언어",
-  "settings_language_english": "영어",
-  "settings_language_simplified_chinese": "중국어 간체",
-  "settings_language_traditional_chinese": "중국어 번체",
+  "settings_language_english": "English",
+  "settings_language_simplified_chinese": "简体中文",
+  "settings_language_traditional_chinese": "繁體中文",
   "settings_language_korean": "한국어",
-  "settings_language_french": "프랑스어",
+  "settings_language_french": "Français",
   "settings_language_no_results": "언어를 찾을 수 없습니다",
   "nav_recent_edits": "최근 편집",
   "recent_edits_title": "최근 편집",

frontend/messages/zh-CN.json

@@ -869,9 +869,9 @@
   "settings_language_label": "界面语言",
   "settings_language_english": "English",
   "settings_language_simplified_chinese": "简体中文",
-  "settings_language_traditional_chinese": "繁体中文",
-  "settings_language_korean": "韩语",
-  "settings_language_french": "法语",
+  "settings_language_traditional_chinese": "繁體中文",
+  "settings_language_korean": "한국어",
+  "settings_language_french": "Français",
   "settings_language_no_results": "未找到语言",
   "nav_recent_edits": "最近编辑",
   "recent_edits_title": "最近编辑",

frontend/messages/zh-TW.json

@@ -1,11 +1,16 @@
 import { defineConfig } from "@playwright/test";
 
 const isCI = process.env.CI === "true";
+const isSelfHostedCI =
+  isCI && process.env.RUNNER_ENVIRONMENT === "self-hosted";
 
 export default defineConfig({
   testDir: "e2e",
   timeout: isCI ? 45_000 : 20_000,
-  workers: isCI ? 8 : undefined,
+  // The managed runner exposes more host CPUs than its pod can use, so keep
+  // its worker count bounded. GitHub-hosted runners should retain Playwright's
+  // adaptive default rather than overcommitting a smaller VM.
+  workers: isSelfHostedCI ? 8 : undefined,
   retries: 0,
   use: {
     baseURL: "http://127.0.0.1:8090",

frontend/playwright.config.ts

@@ -124,9 +124,9 @@ describe("SettingsPage", () => {
     trigger!.click();
     await tick();
 
-    const option = Array.from(document.body.querySelectorAll('[role="option"]')).find((el) =>
-      el.textContent?.includes("Simplified Chinese"),
-    );
+    const option = Array.from(
+      document.body.querySelectorAll('[role="option"]'),
+    ).find((el) => el.textContent?.includes("简体中文"));
     expect(option).toBeTruthy();
 
     (option as HTMLElement).dispatchEvent(new MouseEvent("mousedown", { bubbles: true }));

frontend/src/lib/components/settings/SettingsPage.test.ts

@@ -119,11 +119,11 @@ describe("i18n locale selection", () => {
     })).toBe("12 个会话");
 
     runtime.setLocale("zh-TW", { reload: false });
-    expect(m.nav_sessions()).toBe("會話");
+    expect(m.nav_sessions()).toBe("對話");
     expect(m.status_bar_sessions({
       count: 12,
       countLabel: "12",
-    })).toBe("12 個會話");
+    })).toBe("12 個對話");
 
     runtime.setLocale("ko", { reload: false });
     expect(m.nav_sessions()).toBe("세션");
@@ -179,7 +179,7 @@ describe("i18n locale selection", () => {
     runtime.setLocale("zh-TW", { reload: false });
     expect(m.tool_call_group_call_count({ count: 1 })).toBe("1 次 tool call");
     expect(m.tool_call_group_call_count({ count: 3 })).toBe("3 次 tool call");
-    expect(m.subagent_inline_message_count({ count: 1 })).toBe("1 條消息");
+    expect(m.subagent_inline_message_count({ count: 1 })).toBe("1 則訊息");
 
     // Korean has no plural distinction, so a single variant serves every count.
     runtime.setLocale("ko", { reload: false });