refactor(i18n): 扁平化国际化语言配置结构

移除多层嵌套的语言对象层级，将翻译项直接挂载到顶层lang对象下，简化语言文件结构，提升维护性

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

@@ -1,27 +1,19 @@
 export const lang = {
-
-	// Seal detail
-	seal: {
-		medium: {
-			detail: {
-				// Page title
-				title: 'Seal Details',
-				// Export image
-				exportImage: 'Export Image',
-				// Export PDF
-				exportPdf: 'Export PDF',
-				// Loading
-				loading: 'Loading',
-				// File does not exist
-				fileNotExist: 'File does not exist',
-				// Save success
-				saveSuccess: 'Saved successfully',
-				// Save failed
-				saveFailed: 'Save failed',
-				// Download failed
-				downloadFailed: 'Download failed',
-			}
-		}
-	}
+	// Page title
+	title: 'Seal Details',
+	// Export image
+	exportImage: 'Export Image',
+	// Export PDF
+	exportPdf: 'Export PDF',
+	// Loading
+	loading: 'Loading',
+	// File does not exist
+	fileNotExist: 'File does not exist',
+	// Save success
+	saveSuccess: 'Saved successfully',
+	// Save failed
+	saveFailed: 'Save failed',
+	// Download failed
+	downloadFailed: 'Download failed',
 
 }

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

@@ -1,24 +1,16 @@
 export const lang = {
-
-	// Seal search page
-	seal: {
-		medium: {
-			search: {
-				title: 'Medium Material Search',
-				// Search input placeholder
-				placeholder: 'Enter keywords to search',
-				// Search results title
-				searchResult: 'Search Results',
-				// Empty data tip
-				noData: 'No Data',
-				// Modal title
-				tip: 'Tip',
-				// 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?',
-			}
-		}
-	}
+	title: 'Medium Material Search',
+	// Search input placeholder
+	placeholder: 'Enter keywords to search',
+	// Search results title
+	searchResult: 'Search Results',
+	// Empty data tip
+	noData: 'No Data',
+	// Modal title
+	tip: 'Tip',
+	// 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?',
 
 }