feat: 通報の強化 (#14704)

* wip

* Update CHANGELOG.md

* lint

* Update types.ts

* wip

* ✌️

* Update MkAbuseReport.vue

* tweak

packages/frontend/src/pages/instance-info.vue

@@ -51,6 +51,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 						<MkButton @click="refreshMetadata"><i class="ti ti-refresh"></i> Refresh metadata</MkButton>
 						<MkTextarea v-model="moderationNote" manualSave>
 							<template #label>{{ i18n.ts.moderationNote }}</template>
+							<template #caption>{{ i18n.ts.moderationNoteDescription }}</template>
 						</MkTextarea>
 					</div>
 				</FormSection>