added a heltext for the nfty url helptext (#3484)

src/components/notifications/Ntfy.vue

@@ -7,8 +7,9 @@
     </div>
     <div class="mb-3">
         <label for="ntfy-server-url" class="form-label">{{ $t("Server URL") }}</label>
-        <div class="input-group mb-3">
         <input id="ntfy-server-url" v-model="$parent.notification.ntfyserverurl" type="text" class="form-control" required>
+        <div class="form-text">
+            {{ $t("Server URL should not contain the nfty topic") }}
         </div>
     </div>
     <div class="mb-3">

src/lang/en.json

@@ -690,6 +690,7 @@
     "Octopush API Version": "Octopush API Version",
     "Legacy Octopush-DM": "Legacy Octopush-DM",
     "ntfy Topic": "ntfy Topic",
+    "Server URL should not contain the nfty topic": "Server URL should not contain the nfty topic",
     "onebotHttpAddress": "OneBot HTTP Address",
     "onebotMessageType": "OneBot Message Type",
     "onebotGroupMessage": "Group",