fix: add i18n keys for Traffic tab, prevent sort mutation

- Add traffic tab/section locale keys to ru, en, zh, fa
- Use spread copy before .sort() to avoid mutating React Query cache

src/locales/ru.json

@@ -1514,9 +1514,19 @@
       "tabs": {
         "overview": "Обзор",
         "nodes": "Ноды",
+        "traffic": "Трафик",
         "squads": "Сквады",
         "sync": "Синхронизация"
       },
+      "traffic": {
+        "noData": "Нет данных о трафике",
+        "totalDownload": "Загрузка",
+        "totalUpload": "Отдача",
+        "totalTraffic": "Всего",
+        "online": "онлайн",
+        "inbounds": "Inbounds",
+        "outbounds": "Outbounds"
+      },
       "overview": {
         "system": "Система",
         "usersOnline": "Онлайн",