✨ Add translation features

frontend/src/i18n/locales/en-US.ts

@@ -197,6 +197,10 @@ export default {
       name: 'Color Selector',
       description: 'Visual color picker and color value display'
     },
+    translator: {
+      name: 'Text Translator',
+      description: 'Translate selected text with multiple translation services'
+    },
     minimap: {
       name: 'Minimap',
       description: 'Display minimap overview of the document'

frontend/src/i18n/locales/zh-CN.ts

@@ -198,6 +198,10 @@ export default {
       name: '颜色选择器',
       description: '颜色值的可视化和选择'
     },
+    translator: {
+      name: '划词翻译',
+      description: '选择文本后显示翻译按钮，支持多种翻译服务'
+    },
     minimap: {
       name: '小地图',
       description: '显示小地图视图'