refactor: 完成多语言国际化全量替换与补充

1. 新增大量中英文语言包文件，覆盖自定义组件、页面、工具类的文案
2. 替换硬编码文本为多语言调用，统一全局文案管理
3. 优化语言包结构，拆分公共模块与业务模块
4. 修复部分语言加载与国际化适配问题

lang/en-us/seal/medium/search.js

@@ -1,23 +1,23 @@
 export const lang = {
-	//title为每个页面的标题
-	title: 'Material Search',
 
+	// Seal search page
 	seal: {
 		medium: {
 			search: {
 				// Search input placeholder
-				placeholder: "Enter medium name e.g. 'gasoline'",
+				placeholder: 'Enter keywords to search',
 				// Search results title
 				searchResult: 'Search Results',
-				// Empty state text
+				// Empty data tip
 				noData: 'No Data',
 				// Modal title
 				tip: 'Tip',
-				// Delete all history confirmation
-				confirmDeleteAllHistory: 'Confirm delete all history?',
-				// Delete single history record confirmation
-				confirmDeleteHistory: 'Confirm delete this history record?',
+				// Confirm delete all history
+				confirmDeleteAllHistory: 'Are you sure you want to delete all search history?',
+				// Confirm delete single history item
+				confirmDeleteHistory: 'Are you sure you want to delete this search history?',
 			}
 		}
 	}
+
 }