fix: 添加缺失的 i18n 翻译键 general.max_length

web/src/react-i18next/locales/en-US.json

@@ -50,7 +50,8 @@
     "upload": "Upload",
     "offline": "Offline",
     "online": "Online",
-    "search_placeholder": "Search keyword"
+    "search_placeholder": "Search keyword",
+    "max_length": "Maximum length is {{max}} characters"
   },
   "actions": {
     "new": "New",

web/src/react-i18next/locales/ja-JP.json

@@ -50,7 +50,8 @@
     "upload": "アップロード",
     "offline": "オフライン",
     "online": "オンライン",
-    "search_placeholder": "キーワード検索"
+    "search_placeholder": "キーワード検索",
+    "max_length": "最大長は {{max}} 文字です"
   },
   "actions": {
     "new": "新規",

web/src/react-i18next/locales/zh-TW.json

@@ -50,7 +50,8 @@
     "upload": "上傳",
     "offline": "離線",
     "online": "線上",
-    "search_placeholder": "關鍵字搜尋"
+    "search_placeholder": "關鍵字搜尋",
+    "max_length": "最大長度為 {{max}} 個字元"
   },
   "actions": {
     "new": "新增",