diff --git a/src/i18n/strings/ja.json b/src/i18n/strings/ja.json
index 9e26dfeeb6..862b45b21a 100644
--- a/src/i18n/strings/ja.json
+++ b/src/i18n/strings/ja.json
@@ -1 +1,61 @@
-{}
\ No newline at end of file
+{
+ "All messages": "全ての発言",
+ "All messages (loud)": "全ての発言(通知音あり)",
+ "Cancel": "取消",
+ "Close": "閉じる",
+ "Create new room": "新しい部屋を作成",
+ "Direct Chat": "対話",
+ "Favourite": "お気に入り",
+ "Hide panel": "右欄を非表示",
+ "Invite to this room": "この部屋へ招待",
+ "Low Priority": "低優先度",
+ "Members": "参加者",
+ "Mentions only": "呼び掛けられた時のみ",
+ "Mute": "通知しない",
+ "Notifications": "通知",
+ "Report a bug": "バグを報告",
+ "Resend": "再送信",
+ "Riot is not supported on mobile web. Install the app?": "Riotはスマートフォンでの表示に対応していません。できればアプリをインストールして頂けませんでしょうか?",
+ "Room directory": "公開部屋一覧",
+ "Room not found": "部屋が見つかりません",
+ "Search": "検索",
+ "Search…": "検索…",
+ "Send": "送信",
+ "Settings": "設定",
+ "Sorry, your browser is not able to run Riot.": "申し訳ありません。あなたのブラウザではRiotは動作できません。",
+ "Start chat": "対話開始",
+ "This Room": "この部屋",
+ "Waiting for response from server": "サーバからの応答を待っています",
+ "You cannot delete this message. (%(code)s)": "あなたはこの発言を削除できません (%(code)s)",
+ "Sunday": "日曜日",
+ "Monday": "月曜日",
+ "Tuesday": "火曜日",
+ "Wednesday": "水曜日",
+ "Thursday": "木曜日",
+ "Friday": "金曜日",
+ "Saturday": "土曜日",
+ "Today": "今日",
+ "Yesterday": "昨日",
+ "Warning": "警告",
+ "No update available.": "更新はありません。",
+ "Welcome to Riot.im": "Riot.imへようこそ",
+ "Search the room directory": "部屋一覧を検索",
+ "Failed to change password. Is your password correct?": "パスワード変更に失敗しました。パスワードは正しいですか?",
+ "Set Password": "パスワードを設定",
+ "Safari and Opera work too.": "SafariとOperaでも動作します。",
+ "A new version of Riot is available.": "新しいバージョンのRiotが利用可能です。",
+ "All Rooms": "全ての部屋",
+ "Changelog": "変更履歴",
+ "Directory": "部屋一覧",
+ "Download this file": "この添付ファイルをダウンロード",
+ "Enable desktop notifications": "デスクトップ画面に通知を行う",
+ "Enable email notifications": "電子メールでの通知を行う",
+ "Enable notifications for this account": "このアカウントで通知を行う",
+ "Failed to change settings": "設定の変更に失敗しました",
+ "Failed to get public room list": "公開部屋一覧の取得に失敗しました",
+ "Failed to join the room": "部屋への参加に失敗しました",
+ "Filter room names": "部屋名検索",
+ "Forget": "忘れる",
+ "Leave": "退室",
+ "Files": "添付ファイル"
+}