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/en.json

@@ -1493,9 +1493,19 @@
       "tabs": {
         "overview": "Overview",
         "nodes": "Nodes",
+        "traffic": "Traffic",
         "squads": "Squads",
         "sync": "Sync"
       },
+      "traffic": {
+        "noData": "No traffic data available",
+        "totalDownload": "Download",
+        "totalUpload": "Upload",
+        "totalTraffic": "Total",
+        "online": "online",
+        "inbounds": "Inbounds",
+        "outbounds": "Outbounds"
+      },
       "overview": {
         "system": "System",
         "usersOnline": "Online",