diff --git a/src/i18n/strings/ja.json b/src/i18n/strings/ja.json
index 9e26dfee..862b45b2 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 <b>not</b> able to run Riot.": "申し訳ありません。あなたのブラウザではRiotは<b>動作できません</b>。",
+    "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",
+    "<a href=\"http://apple.com/safari\">Safari</a> and <a href=\"http://opera.com\">Opera</a> work too.": "<a href=\"http://apple.com/safari\">Safari</a>と<a href=\"http://opera.com\">Opera</a>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"
+}