enhance(frontend): Add an option to customize Lockdown duration (#16405)

* chore(locales): Add "setManually" and "_time.month"

Add Japanese locales to auto-generate other languages.

* feat(frontend): Add text fields to set lockdown duration manually

Choose from presets or set it manually.

* refactor(frontend): Make objects contains option's values and labels

When adding a new option, it needed to write two times.

* docs(changelog): Add a description about this change

Users can notice what's changed by this PR.

* refactor(frontend): Manage state by MkSelect

The functions only initialize the values.

* refactor(frontend): Make the custom input as writable computed

Clean up the MkInput components.

* chore(locales): Switch to "custom"

A single word is better than sentence on this situation.

* refactor(frontend): Insert the custom button to presets

Users don't need to click multiple times to use prests.

CHANGELOG.md

@@ -39,6 +39,7 @@
 - Enhance: 不必要な翻訳データを読み込まなくなり、パフォーマンスが向上しました
 - Enhance: 画像エフェクトのパラメータ名の多言語対応
 - Enhance: 依存ソフトウェアの更新
+- Enhance: ノートを非表示にする相対期間を1ヶ月単位で自由に指定できるように
 - Fix: 投稿フォームでファイルのアップロードが中止または失敗した際のハンドリングを修正
 - Fix: 一部の設定検索結果が存在しないパスになる問題を修正  
   (Cherry-picked from https://activitypub.software/TransFem-org/Sharkey/-/merge_requests/1171)