Implement internationalization (i18n) system for LoRA Manager

- Added i18n support with automatic language detection based on browser settings.
- Implemented translations for English (en) and Simplified Chinese (zh-CN).
- Created utility functions for text replacement in HTML templates and JavaScript.
- Developed a comprehensive translation key structure for various application components.
- Added formatting functions for numbers, dates, and file sizes according to locale.
- Included RTL language support and dynamic updates for DOM elements.
- Created tests to verify the functionality of the i18n system.

static/js/statistics.js

@@ -1,6 +1,7 @@
 // Statistics page functionality
 import { appCore } from './core.js';
 import { showToast } from './utils/uiHelpers.js';
+import { initializePageI18n } from './utils/i18nHelpers.js';
 
 // Chart.js import (assuming it's available globally or via CDN)
 // If Chart.js isn't available, we'll need to add it to the project
@@ -26,6 +27,9 @@ class StatisticsManager {
         // Initialize charts and visualizations
         this.initializeVisualizations();
         
+        // Initialize i18n for the page
+        initializePageI18n();
+        
         this.initialized = true;
     }