Add Japanese translations. (#8927)

app/javascript/mastodon/locales/en.json

@@ -91,6 +91,8 @@
   "confirmations.mute.message": "Are you sure you want to mute {name}?",
   "confirmations.redraft.confirm": "Delete & redraft",
   "confirmations.redraft.message": "Are you sure you want to delete this status and re-draft it? Favourites and boosts will be lost, and replies to the original post will be orphaned.",
+  "confirmations.reply.confirm": "Reply",
+  "confirmations.reply.message": "Replying now will overwrite the message you are currently composing. Are you sure you want to proceed?",
   "confirmations.unfollow.confirm": "Unfollow",
   "confirmations.unfollow.message": "Are you sure you want to unfollow {name}?",
   "embed.instructions": "Embed this status on your website by copying the code below.",
@@ -294,6 +296,7 @@
   "status.open": "Expand this status",
   "status.pin": "Pin on profile",
   "status.pinned": "Pinned toot",
+  "status.read_more": "Read more",
   "status.reblog": "Boost",
   "status.reblog_private": "Boost to original audience",
   "status.reblogged_by": "{name} boosted",

app/javascript/mastodon/locales/ja.json

@@ -91,6 +91,8 @@
   "confirmations.mute.message": "本当に{name}さんをミュートしますか？",
   "confirmations.redraft.confirm": "削除して下書きに戻す",
   "confirmations.redraft.message": "本当にこのトゥートを削除して下書きに戻しますか？ このトゥートへのお気に入り登録やブーストは失われ、返信は孤立することになります。",
+  "confirmations.reply.confirm": "返信",
+  "confirmations.reply.message": "今返信すると現在作成中のメッセージが上書きされます。本当に実行しますか？",
   "confirmations.unfollow.confirm": "フォロー解除",
   "confirmations.unfollow.message": "本当に{name}さんのフォローを解除しますか？",
   "embed.instructions": "下記のコードをコピーしてウェブサイトに埋め込みます。",
@@ -294,6 +296,7 @@
   "status.open": "詳細を表示",
   "status.pin": "プロフィールに固定表示",
   "status.pinned": "固定されたトゥート",
+  "status.read_more": "もっと見る",
   "status.reblog": "ブースト",
   "status.reblog_private": "ブースト",
   "status.reblogged_by": "{name}さんがブースト",