Add copy functionality messages to chat locales

- Add copyEmpty message
- Add copySuccess variants
- Add copyFailed message
- Add manual copy instruction
- Support 5 languages (ar,en,fr,zh,zh_TW)

lightrag_webui/src/locales/ar.json

@@ -351,6 +351,12 @@
     "chatMessage": {
       "copyTooltip": "نسخ إلى الحافظة",
       "copyError": "فشل نسخ النص إلى الحافظة",
+      "copyEmpty": "لا يوجد محتوى للنسخ",
+      "copySuccess": "تم نسخ المحتوى إلى الحافظة",
+      "copySuccessLegacy": "تم نسخ المحتوى (الطريقة التقليدية)",
+      "copySuccessManual": "تم نسخ المحتوى (الطريقة اليدوية)",
+      "copyFailed": "فشل نسخ المحتوى",
+      "copyManualInstruction": "يرجى تحديد ونسخ النص يدوياً",
       "thinking": "جاري التفكير...",
       "thinkingTime": "وقت التفكير {{time}} ثانية",
       "thinkingInProgress": "التفكير قيد التقدم..."

lightrag_webui/src/locales/en.json

@@ -351,6 +351,12 @@
     "chatMessage": {
       "copyTooltip": "Copy to clipboard",
       "copyError": "Failed to copy text to clipboard",
+      "copyEmpty": "No content to copy",
+      "copySuccess": "Content copied to clipboard",
+      "copySuccessLegacy": "Content copied (legacy method)",
+      "copySuccessManual": "Content copied (manual method)",
+      "copyFailed": "Failed to copy content",
+      "copyManualInstruction": "Please select and copy the text manually",
       "thinking": "Thinking...",
       "thinkingTime": "Thinking time {{time}}s",
       "thinkingInProgress": "Thinking in progress..."

lightrag_webui/src/locales/fr.json

@@ -351,6 +351,12 @@
     "chatMessage": {
       "copyTooltip": "Copier dans le presse-papiers",
       "copyError": "Échec de la copie du texte dans le presse-papiers",
+      "copyEmpty": "Aucun contenu à copier",
+      "copySuccess": "Contenu copié dans le presse-papiers",
+      "copySuccessLegacy": "Contenu copié (méthode héritée)",
+      "copySuccessManual": "Contenu copié (méthode manuelle)",
+      "copyFailed": "Échec de la copie du contenu",
+      "copyManualInstruction": "Veuillez sélectionner et copier le texte manuellement",
       "thinking": "Réflexion en cours...",
       "thinkingTime": "Temps de réflexion {{time}}s",
       "thinkingInProgress": "Réflexion en cours..."

lightrag_webui/src/locales/zh.json

@@ -351,6 +351,12 @@
     "chatMessage": {
       "copyTooltip": "复制到剪贴板",
       "copyError": "复制文本到剪贴板失败",
+      "copyEmpty": "没有内容可复制",
+      "copySuccess": "内容已复制到剪贴板",
+      "copySuccessLegacy": "内容已复制（传统方法）",
+      "copySuccessManual": "内容已复制（手动方法）",
+      "copyFailed": "复制内容失败",
+      "copyManualInstruction": "请手动选择并复制文本",
       "thinking": "正在思考...",
       "thinkingTime": "思考用时 {{time}} 秒",
       "thinkingInProgress": "思考进行中..."

lightrag_webui/src/locales/zh_TW.json

@@ -351,6 +351,12 @@
     "chatMessage": {
       "copyTooltip": "複製到剪貼簿",
       "copyError": "複製文字到剪貼簿失敗",
+      "copyEmpty": "沒有內容可複製",
+      "copySuccess": "內容已複製到剪貼簿",
+      "copySuccessLegacy": "內容已複製（傳統方法）",
+      "copySuccessManual": "內容已複製（手動方法）",
+      "copyFailed": "複製內容失敗",
+      "copyManualInstruction": "請手動選取並複製文字",
       "thinking": "正在思考...",
       "thinkingTime": "思考用時 {{time}} 秒",
       "thinkingInProgress": "思考進行中..."