Add PreUp, PostUp, PreDown, PostDown for client (#1714)

* Fix create client popup background is not white

* Fix no Add button when client Allowed Ips or Server Allowed Ips is empty

* Add preUp preDown postUp postDown for client

* Add description of hooks for client config

* Move hooks's label text into 'hooks' in en.json

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Co-authored-by: yanghuanglin <yanghuanglin@qq.com>
Co-authored-by: Bernd Storath <999999bst@gmail.com>

src/i18n/locales/en.json

@@ -98,7 +98,10 @@
     "allowedIpsDesc": "Which IPs will be routed through the VPN",
     "serverAllowedIpsDesc": "Which IPs the server will route to the client",
     "mtuDesc": "Sets the maximum transmission unit (packet size) for the VPN tunnel",
-    "persistentKeepaliveDesc": "Sets the interval (in seconds) for keep-alive packets. 0 disables it"
+    "persistentKeepaliveDesc": "Sets the interval (in seconds) for keep-alive packets. 0 disables it",
+    "hooks": "Hooks",
+    "hooksDescription": "Hooks only work with wg-quick",
+    "hooksLeaveEmpty": "Only for wg-quick. Otherwise, leave it empty"
   },
   "dialog": {
     "change": "Change",
@@ -208,5 +211,11 @@
     "dns": "DNS",
     "allowedIps": "Allowed IPs",
     "file": "File"
+  },
+  "hooks": {
+    "preUp": "PreUp",
+    "postUp": "PostUp",
+    "preDown": "PreDown",
+    "postDown": "PostDown"
   }
 }