fix(proxy): check if proxy port is in use #5891

src/locales/fa/settings.json

@@ -252,6 +252,7 @@
         "random": "پورت تصادفی"
       },
       "messages": {
+        "portInUse": "Port {{port}} is already in use",
         "saved": "Port settings saved",
         "saveFailed": "Failed to save port settings"
       }