upgrade & opt

- flutter 3.0.1
- show snackbar when no server to ping
- server detail page replace nice to iowait
- make script show stdout when error

lib/l10n/intl_en.arb

@@ -115,5 +115,6 @@
     "platformNotSupportUpdate": "Current platform does not support in app update.\nPlease build from source and install it.",
     "invalidVersionHelp": "Please make sure that docker is installed correctly, or that you are using a non-self-compiled version. If you don't have the above issues, please submit an issue on {url}.",
     "noInterface": "No interface",
-    "lastTry": "Last try!"
+    "lastTry": "Last try!",
+    "pingNoServer": "No server to ping.\nPlease add a server in server tab."
 }

lib/l10n/intl_zh.arb

@@ -115,5 +115,6 @@
     "platformNotSupportUpdate": "当前平台不支持更新，请编译最新源码后手动安装",
     "invalidVersionHelp": "请确保正确安装了docker，或者使用的非自编译版本。如果没有以上问题，请在 {url} 提交问题。",
     "noInterface": "没有可用的接口",
-    "lastTry": "最后尝试"
+    "lastTry": "最后尝试",
+    "pingNoServer": "没有服务器可用于Ping\n请在服务器tab添加服务器后再试"
 }