DHCP: Make clear that only active dynamic leases are shown, closes #777

frontend/src/locales/de.json

@@ -653,7 +653,8 @@
     "dhcp_leases": {
       "leases": {
         "active_leases": "Aktive Leases in BCD \"{name}\"",
-        "transmitted_hostname": "Übermittelter Hostname"
+        "transmitted_hostname": "Übermittelter Hostname",
+        "static_warning": "Aktuell können aus technischen Gründen nur aktive dynamische Leases angezeigt werden."
       }
     },
     "dnsvs": {

frontend/src/locales/en.json

@@ -651,7 +651,8 @@
     "dhcp_leases": {
       "leases": {
         "active_leases": "Active Leases in BCD \"{name}\"",
-        "transmitted_hostname": "Transmitted hostname"
+        "transmitted_hostname": "Transmitted hostname",
+        "static_warning": "Currently only active dynamic leases can be shown due to technical reasons."
       }
     },
     "dnsvs": {

frontend/src/views/dhcp_leases/Leases.vue

 <template>
   <div class="dhcp-leases">
     <h1>{{ $t('views.dhcp_leases.leases.active_leases', { name: $route.params.bcd_name }) }}</h1>
+    <b-alert variant="info" show>
+      {{ $t('views.dhcp_leases.leases.static_warning')}}
+    </b-alert>
     <Loading :data="leases">
       <b-table responsive striped :items="leases" :busy="!leases" :fields="table_fields">
         <template v-slot:cell(ip)="data">