rename backup storage to sites

dashboard/src/views/BackupSitesView.vue

@@ -214,7 +214,7 @@ onMounted(async () => {
     <BackupSiteEditDialog ref="backupSiteEditDialog" @success="refresh()"/>
     <BackupScheduleDialog ref="backupScheduleDialog" @success="refresh()"/>
 
-    <Section :title="$t('backup.target.title')">
+    <Section :title="$t('backup.sites.title')">
       <template #header-buttons>
         <Button @click="onAdd()" icon="fa-solid fa-plus"> {{ $t('main.action.add') }}</Button>
       </template>
@@ -244,11 +244,10 @@ onMounted(async () => {
       </div>
     </Section>
 
-    <Section :title="$t('backup.updateTarget.title')">
+    <Section :title="$t('backup.updateSite.title')">
       <SettingsItem>
         <div>
-          <label>{{ $t('backup.target.label') }}</label>
-          <div>{{ $t('backup.updateTarget.description') }}</div>
+          <div>{{ $t('backup.updateSite.description') }}</div>
         </div>
         <div style="display: flex; align-items: center">
           <SingleSelect style="min-width: 160px" :disabled="primarySiteChangeBusy" v-model="primarySiteId" :searchThreshold="10" :options="sites" option-key="id" option-label="name" @select="onPrimarySiteChanged" />