fix(mqtt): localize max packet size label in connection dialog

apps/desktop/src/components/connection/ConnectionDialog.vue

@@ -7798,7 +7798,7 @@ function openExternalUrl(url: string) {
                       <Input v-model.number="mqttConnectTimeoutSecs" type="number" class="col-span-3 w-32" min="1" max="300" />
                     </div>
                     <div class="grid grid-cols-4 items-center gap-4">
-                      <Label :class="connectionLabelClass">最大报文（字节）</Label>
+                      <Label :class="connectionLabelClass">{{ t("connection.mqttMaxPacketSize") }}</Label>
                       <Input v-model.number="mqttMaxPacketSizeBytes" type="number" class="col-span-3 w-40" min="1024" max="268435455" />
                     </div>
                   </template>