diff --git a/i18n/ja.json b/i18n/ja.json
index 55df5923..fa7c063e 100644
--- a/i18n/ja.json
+++ b/i18n/ja.json
@@ -1,10 +1,10 @@
 {
     "PrivateBin": "PrivateBin",
-    "%s is a minimalist, open source online pastebin where the server has zero knowledge of pasted data. Data is encrypted/decrypted %sin the browser%s using 256 bits AES.": "%s is a minimalist, open source online pastebin where the server has zero knowledge of pasted data. Data is encrypted/decrypted %sin the browser%s using 256 bits AES.",
-    "More information on the <a href=\"https://privatebin.info/\">project page</a>.": "More information on the <a href=\"https://privatebin.info/\">project page</a>.",
+    "%s is a minimalist, open source online pastebin where the server has zero knowledge of pasted data. Data is encrypted/decrypted %sin the browser%s using 256 bits AES.": "%s はミニマリストで、オープンソースのオンラインデータ貼り付けサービスです。サーバーに、貼り付けられたデータの中身を読み取ることはできません。データは、256ビットのAESを用いて%sブラウザー上で%s暗号化、または復号化されます。",
+    "More information on the <a href=\"https://privatebin.info/\">project page</a>.": "詳細については<a href=\"https://privatebin.info/\">プロジェクトのページ</a>をご覧ください。",
     "Because ignorance is bliss": "知らぬが仏",
-    "Paste does not exist, has expired or has been deleted.": "Paste does not exist, has expired or has been deleted.",
-    "%s requires php %s or above to work. Sorry.": "%s requires php %s or above to work. Sorry.",
+    "Paste does not exist, has expired or has been deleted.": "ペーストが存在しないか、期限切れ、または削除されました。",
+    "%s requires php %s or above to work. Sorry.": "%s の動作には php %s 以上が必要です。申し訳ありません。",
     "%s requires configuration section [%s] to be present in configuration file.": "%s requires configuration section [%s] to be present in configuration file.",
     "Please wait %d seconds between each post.": [
         "Please wait %d second between each post. (singular)",
@@ -19,29 +19,29 @@
     "You are unlucky. Try again.": "You are unlucky. Try again.",
     "Error saving comment. Sorry.": "コメントの保存中にエラーが発生しました。申し訳ありません。",
     "Error saving paste. Sorry.": "ペーストの保存中にエラーが発生しました。申し訳ありません。",
-    "Invalid paste ID.": "Invalid paste ID.",
+    "Invalid paste ID.": "無効なペーストIDです。",
     "Paste is not of burn-after-reading type.": "Paste is not of burn-after-reading type.",
     "Wrong deletion token. Paste was not deleted.": "Wrong deletion token. Paste was not deleted.",
-    "Paste was properly deleted.": "Paste was properly deleted.",
+    "Paste was properly deleted.": "ペーストが正しく削除されました。",
     "JavaScript is required for %s to work. Sorry for the inconvenience.": "%s の動作にはJavaScriptが必要です。ご迷惑をおかけして申し訳ありません。",
     "%s requires a modern browser to work.": "%s の動作には最近のブラウザが必要です。",
     "New": "新しい",
     "Send": "送る",
     "Clone": "複製",
     "Raw text": "未加工テキスト",
-    "Expires": "Expires",
-    "Burn after reading": "Burn after reading",
-    "Open discussion": "Open discussion",
+    "Expires": "有効期限",
+    "Burn after reading": "読み込んだ後に消去",
+    "Open discussion": "ディスカッションを開く",
     "Password (recommended)": "パスワード（推奨）",
-    "Discussion": "Discussion",
-    "Toggle navigation": "Toggle navigation",
+    "Discussion": "ディスカッション",
+    "Toggle navigation": "ナビゲーションを切り替え",
     "%d seconds": [
-        "%d second (singular)",
-        "%d seconds (1st plural)",
-        "%d seconds (2nd plural)",
-        "%d seconds (3rd plural)",
-        "%d seconds (4th plural)",
-        "%d seconds (5th plural)"
+        "%d秒",
+        "%d秒",
+        "%d秒",
+        "%d秒",
+        "%d秒",
+        "%d秒"
     ],
     "%d minutes": [
         "%d 分",
@@ -68,7 +68,7 @@
         "%d 日"
     ],
     "%d weeks": [
-        "%d week (singular)",
+        "%d週",
         "%d weeks (1st plural)",
         "%d weeks (2nd plural)",
         "%d weeks (3rd plural)",
@@ -141,16 +141,16 @@
     "Reply": "Reply",
     "Anonymous": "Anonymous",
     "Avatar generated from IP address": "Avatar generated from IP address",
-    "Add comment": "Add comment",
+    "Add comment": "コメントを追加",
     "Optional nickname…": "Optional nickname…",
-    "Post comment": "Post comment",
+    "Post comment": "コメントを投稿",
     "Sending comment…": "Sending comment…",
-    "Comment posted.": "Comment posted.",
+    "Comment posted.": "コメントを投稿しました。",
     "Could not refresh display: %s": "Could not refresh display: %s",
-    "unknown status": "unknown status",
+    "unknown status": "不明な状態",
     "server error or not responding": "server error or not responding",
     "Could not post comment: %s": "Could not post comment: %s",
-    "Sending paste…": "Sending paste…",
+    "Sending paste…": "ペーストを送信しています…",
     "Your paste is <a id=\"pasteurl\" href=\"%s\">%s</a> <span id=\"copyhint\">(Hit [Ctrl]+[c] to copy)</span>": "Your paste is <a id=\"pasteurl\" href=\"%s\">%s</a> <span id=\"copyhint\">(Hit [Ctrl]+[c] to copy)</span>",
     "Delete data": "Delete data",
     "Could not create paste: %s": "Could not create paste: %s",
@@ -164,53 +164,53 @@
     "EiB": "EiB",
     "ZiB": "ZiB",
     "YiB": "YiB",
-    "Format": "Format",
-    "Plain Text": "Plain Text",
-    "Source Code": "Source Code",
+    "Format": "形式",
+    "Plain Text": "プレーンテキスト",
+    "Source Code": "ソースコード",
     "Markdown": "Markdown",
-    "Download attachment": "Download attachment",
+    "Download attachment": "添付ファイルをダウンロード",
     "Cloned: '%s'": "Cloned: '%s'",
     "The cloned file '%s' was attached to this paste.": "The cloned file '%s' was attached to this paste.",
-    "Attach a file": "Attach a file",
+    "Attach a file": "ファイルを添付",
     "alternatively drag & drop a file or paste an image from the clipboard": "alternatively drag & drop a file or paste an image from the clipboard",
-    "File too large, to display a preview. Please download the attachment.": "File too large, to display a preview. Please download the attachment.",
-    "Remove attachment": "Remove attachment",
+    "File too large, to display a preview. Please download the attachment.": "ファイルが大きすぎるため、プレビューを表示できません。ダウンロードしてください。",
+    "Remove attachment": "添付ファイルを削除",
     "Your browser does not support uploading encrypted files. Please use a newer browser.": "Your browser does not support uploading encrypted files. Please use a newer browser.",
-    "Invalid attachment.": "Invalid attachment.",
-    "Options": "Options",
+    "Invalid attachment.": "不正な添付ファイルです。",
+    "Options": "設定",
     "Shorten URL": "Shorten URL",
     "Editor": "Editor",
-    "Preview": "Preview",
+    "Preview": "プレビュー",
     "%s requires the PATH to end in a \"%s\". Please update the PATH in your index.php.": "%s requires the PATH to end in a \"%s\". Please update the PATH in your index.php.",
-    "Decrypt": "Decrypt",
-    "Enter password": "Enter password",
+    "Decrypt": "復号化",
+    "Enter password": "パスワードを入力",
     "Loading…": "Loading…",
-    "Decrypting paste…": "Decrypting paste…",
+    "Decrypting paste…": "ペーストを復号化しています…",
     "Preparing new paste…": "Preparing new paste…",
     "In case this message never disappears please have a look at <a href=\"%s\">this FAQ for information to troubleshoot</a>.": "In case this message never disappears please have a look at <a href=\"%s\">this FAQ for information to troubleshoot</a>.",
     "+++ no paste text +++": "+++ no paste text +++",
     "Could not get paste data: %s": "Could not get paste data: %s",
-    "QR code": "QR code",
-    "This website is using an insecure HTTP connection! Please use it only for testing.": "This website is using an insecure HTTP connection! Please use it only for testing.",
-    "For more information <a href=\"%s\">see this FAQ entry</a>.": "For more information <a href=\"%s\">see this FAQ entry</a>.",
+    "QR code": "QRコード",
+    "This website is using an insecure HTTP connection! Please use it only for testing.": "このウェブサイトは安全でない HTTP 接続を使用しています！テストにのみ使用してください。",
+    "For more information <a href=\"%s\">see this FAQ entry</a>.": "詳細については、<a href=\"%s\">こちらのFAQエントリー</a>をご覧ください。",
     "Your browser may require an HTTPS connection to support the WebCrypto API. Try <a href=\"%s\">switching to HTTPS</a>.": "Your browser may require an HTTPS connection to support the WebCrypto API. Try <a href=\"%s\">switching to HTTPS</a>.",
     "Your browser doesn't support WebAssembly, used for zlib compression. You can create uncompressed documents, but can't read compressed ones.": "Your browser doesn't support WebAssembly, used for zlib compression. You can create uncompressed documents, but can't read compressed ones.",
     "waiting on user to provide a password": "waiting on user to provide a password",
     "Could not decrypt data. Did you enter a wrong password? Retry with the button at the top.": "Could not decrypt data. Did you enter a wrong password? Retry with the button at the top.",
-    "Retry": "Retry",
+    "Retry": "再試行",
     "Showing raw text…": "Showing raw text…",
-    "Notice:": "Notice:",
-    "This link will expire after %s.": "This link will expire after %s.",
-    "This link can only be accessed once, do not use back or refresh button in your browser.": "This link can only be accessed once, do not use back or refresh button in your browser.",
-    "Link:": "Link:",
+    "Notice:": "注意：",
+    "This link will expire after %s.": "このリンクは%s後に期限切れになります。",
+    "This link can only be accessed once, do not use back or refresh button in your browser.": "このリンクは一度だけアクセスできます。ブラウザで戻ったり更新したりしないでください。",
+    "Link:": "リンク：",
     "Recipient may become aware of your timezone, convert time to UTC?": "Recipient may become aware of your timezone, convert time to UTC?",
-    "Use Current Timezone": "Use Current Timezone",
-    "Convert To UTC": "Convert To UTC",
-    "Close": "Close",
+    "Use Current Timezone": "現在のタイムゾーンを使用",
+    "Convert To UTC": "UTCに変換",
+    "Close": "閉じる",
     "Encrypted note on %s": "Encrypted note on %s",
     "Visit this link to see the note. Giving the URL to anyone allows them to access the note, too.": "Visit this link to see the note. Giving the URL to anyone allows them to access the note, too.",
     "URL shortener may expose your decrypt key in URL.": "URL shortener may expose your decrypt key in URL.",
-    "Save paste": "Save paste",
+    "Save paste": "ペーストを保存",
     "Your IP is not authorized to create pastes.": "Your IP is not authorized to create pastes.",
     "Trying to shorten a URL that isn't pointing at our instance.": "Trying to shorten a URL that isn't pointing at our instance.",
     "Error calling YOURLS. Probably a configuration issue, like wrong or missing \"apiurl\" or \"signature\".": "Error calling YOURLS. Probably a configuration issue, like wrong or missing \"apiurl\" or \"signature\".",