feat: Add i18n support for terminal customization and login stats

- Add comprehensive terminal customization translations (60+ keys) for appearance, behavior, and advanced settings across all 4 languages
- Add SSH login statistics translations
- Update HostManagerEditor to use i18n for all terminal customization UI elements
- Update LoginStatsWidget to use i18n for all UI text
- Add missing logger imports in backend files for improved debugging

src/backend/utils/ssh-key-utils.ts

@@ -1,4 +1,5 @@
 import ssh2Pkg from "ssh2";
+import { sshLogger } from "./logger.js";
 const ssh2Utils = ssh2Pkg.utils;
 
 function detectKeyTypeFromContent(keyContent: string): string {