diff --git a/source/shared/i18n/translations/ja.json b/source/shared/i18n/translations/ja.json
index 63fd350d..6ba3a4bc 100644
--- a/source/shared/i18n/translations/ja.json
+++ b/source/shared/i18n/translations/ja.json
@@ -21,15 +21,15 @@
             "password-placeholder": "保管庫のパスワード..."
         },
         "google-auth-button": "認証",
-        "google-auth-button-title": "グーグルドライブで認証",
-        "google-auth-error": "グーグルの認証に失敗",
+        "google-auth-button-title": "Google Drive で認証",
+        "google-auth-error": "Google の認証に失敗",
         "loader": {
             "dropbox-auth": "認証用の別ウィンドウが開きます",
             "file-prompt": "保管庫ファイルを選択するダイアログが開きます",
             "google-auth": {
-                "instr-1": "You may select the level of permission that Buttercup will use while accessing your <strong>Google Drive</strong> account.",
-                "instr-2": "Selecting an <strong>open</strong> permission setting will grant Buttercup access to all files and folders in your account and connected shares.",
-                "instr-3": "Selecting a <i>non-</i>open setting will grant Buttercup access to files that it has created/accessed previously.",
+                "instr-1": "あなたの <strong>Google Drive</strong> アカウントにアクセスする際に、Buttercupが使用する許可レベルを選択することができます。",
+                "instr-2": "<strong>open</strong> 設定を選択すると、アカウント内のすべてのファイルとフォルダ、および接続された共有へのアクセスが許可されます。",
+                "instr-3": "open<i>以外の</i> 設定を選択すると、Buttercupが以前に作成/アクセスしたファイルにアクセスできるようになります。",
                 "perm-label": "権限",
                 "perm-switch": "開く"
             },
@@ -53,7 +53,7 @@
     },
     "add-vault-page": {
         "cta-button": "保管庫を追加",
-        "description": "No vaults have been added yet...",
+        "description": "保管庫はまだ追加されていません...",
         "title": "新しいスタート"
     },
     "app-menu": {
@@ -77,16 +77,16 @@
         "quit": "退出",
         "search": "検索",
         "unlock-vault": "アンロック",
-        "unlocked-vaults": "{{count}} unlocked vault",
-        "unlocked-vaults_plural": "{{count}} unlocked vaults",
+        "unlocked-vaults": "{{count}} 保管庫をアンロック",
+        "unlocked-vaults_plural": "{{count}} 保管庫をアンロック済み",
         "vaults": "保管庫",
         "view": "表示",
         "window": "ウィンドウ",
-        "window-reposition": "Reposition"
+        "window-reposition": "再配置"
     },
     "biometrics": {
         "prompt": {
-            "store": "store login for vault '{{name}}'",
+            "store": "保管庫 '{{name}}' のログインを保存",
             "unlock-vault": "'{{name}}'をアンロック"
         }
     },
@@ -144,13 +144,13 @@
                 "text": "キャンセル",
                 "title": "認証をキャンセル"
             },
-            "description": "グーグルドライブの保管庫を再認証: {{vault}}",
+            "description": "Google Drive の保管庫を再認証: {{vault}}",
             "error": {
                 "reauth-failed": "再認証に失敗"
             },
             "header": "保管庫の認証期限切れ",
-            "success": "グーグルドライブの再認証に成功: 再度アンロックしてください",
-            "title": "グーグルの再認証"
+            "success": "Google Drive の再認証に成功: 再度アンロックしてください",
+            "title": "Google の再認証"
         },
         "import-file-chooser": {
             "submit-button": "インポート",
@@ -169,7 +169,7 @@
                 "text": "新規作成",
                 "title": "新規保管庫ファイルを作成"
             },
-            "prompt": "Do you wish to create a <i>new</i> vault, or read an existing one?",
+            "prompt": "<i>新しい</i>保管庫を作成しますか、それとも既存のものを読み込みますか?",
             "title": "新しい保管庫ファイルを追加"
         },
         "password-prompt": {
@@ -222,120 +222,120 @@
             "vault-settings-save": "保管庫の設定の保存に失敗",
             "vault-unlock-failed": "保管庫のアンロックに失敗"
         },
-        "export-success": "Successfully exported vault: {{name}}",
-        "import-success": "Successfully imported vault: {{filename}}",
-        "preferences-saved": "Saved preferences",
-        "vault-removed": "Vault removed: {{name}}",
-        "vault-saved": "Vault saved",
-        "vault-settings-saved": "Saved vault settings"
+        "export-success": "保管庫のエクスポートに成功: {{name}}",
+        "import-success": "保管庫のインポートに成功: {{filename}}",
+        "preferences-saved": "設定を保存済み",
+        "vault-removed": "保管庫は削除済み: {{name}}",
+        "vault-saved": "保管庫は保存済み",
+        "vault-settings-saved": "保管庫の設定は保存済み"
     },
     "preferences": {
         "button": {
-            "cancel": "Cancel",
-            "cancel-title": "Cancel Preferences update",
-            "save": "Save",
-            "save-title": "Save changes"
+            "cancel": "キャンセル",
+            "cancel-title": "設定の変更をキャンセル",
+            "save": "保存",
+            "save-title": "変更を保存"
         },
         "item": {
-            "clear-clipboard": "Automatically clear clipboard",
-            "language": "Language",
-            "lock-vaults-after-time": "Lock vaults after time",
-            "lock-vaults-after-time-desc": "Automatically lock vaults after some period of inactivity.",
-            "lock-vaults-window-closed": "Lock vaults if vault window closed",
-            "lock-vaults-window-closed-label": "Lock on close",
+            "clear-clipboard": "クリップボードを自動的にクリア",
+            "language": "言語",
+            "lock-vaults-after-time": "時間経過後に保管庫をロック",
+            "lock-vaults-after-time-desc": "一定時間操作がない場合、保管庫を自動的にロックします。",
+            "lock-vaults-window-closed": "保管庫のウィンドウが閉じられた場合にロック",
+            "lock-vaults-window-closed-label": "閉じた際ににロック",
             "secure-file-host": {
-                "description": "The secure file host allows the <strong>Buttercup Browser Extension</strong> to connect to local vaults on this PC via this application.",
-                "label": "Enable secure file host",
-                "title": "Secure file host"
+                "description": "セキュアファイルホストは、<strong>Buttercup Browser Extension</strong>がこのアプリケーションを介してこのPC上のローカル保管庫に接続することを可能にします。",
+                "label": "安全なファイルホストを有効化",
+                "title": "安全なファイルホスト"
             },
-            "theme": "Theme"
+            "theme": "テーマ"
         },
         "section": {
-            "connectivity": "Connectivity",
-            "debug": "Debug",
-            "general": "General",
-            "privacy": "Privacy",
-            "security": "Security"
+            "connectivity": "接続性",
+            "debug": "デバッグ",
+            "general": "一般的",
+            "privacy": "プライバシー",
+            "security": "セキュリティ"
         },
-        "title": "Preferences"
+        "title": "設定"
     },
     "search": {
         "modal": {
-            "no-results": "No results...",
-            "result-render-error": "Failed rendering search result"
+            "no-results": "結果なし...",
+            "result-render-error": "検索結果の表示に失敗"
         }
     },
     "source-type": {
         "dropbox": "Dropbox",
-        "file": "File",
+        "file": "ファイル",
         "googledrive": "Google Drive",
         "webdav": "WebDAV"
     },
     "theme": {
-        "dark": "Dark",
-        "light": "Light"
+        "dark": "ダーク",
+        "light": "ライト"
     },
     "update": {
-        "available": "Update available: {{version}}",
+        "available": "アップデートが利用可能: {{version}}",
         "dialog": {
-            "close-button": "Close",
-            "close-button-title": "Close update information",
-            "title": "Upgrade to {{version}}",
-            "update-button": "Update",
-            "update-button-title": "Update the application now"
+            "close-button": "閉じる",
+            "close-button-title": "更新情報を閉じる",
+            "title": "{{version}}にアップデート",
+            "update-button": "アップデート",
+            "update-button-title": "今このアプリケーションをアップデート"
         },
-        "downloaded": "Update downloaded",
-        "installed-restart": "Restart",
-        "ready": "Update ready: {{version}}",
-        "view": "View"
+        "downloaded": "アップデートはダウンロード済み",
+        "installed-restart": "再起動",
+        "ready": "更新準備完了: {{version}}",
+        "view": "表示"
     },
     "vault-editor": {
-        "locked-state": "Vault Locked",
-        "pending-state": "Vault Busy",
-        "unlocked-state": "Vault Unlocked"
+        "locked-state": "保管庫はロック済み",
+        "pending-state": "保管庫は作業中",
+        "unlocked-state": "保管庫はアンロック済み"
     },
     "vault-management": {
-        "close-button": "Close",
-        "close-button-title": "Close vault management",
+        "close-button": "閉じる",
+        "close-button-title": "保管庫の管理を閉じる",
         "remove-vault-dialog": {
-            "cancel-button": "Cancel",
-            "cancel-button-title": "Cancel removal",
-            "description": "Are you sure that you want to remove the vault \"{{title}}\"?",
-            "remove-button": "Remove",
-            "remove-button-title": "Confirm vault removal",
-            "title": "Remove Vault"
+            "cancel-button": "キャンセル",
+            "cancel-button-title": "削除をキャンセル",
+            "description": "保管庫 \"{{title}}\" を削除しますか?",
+            "remove-button": "削除",
+            "remove-button-title": "保管庫の削除を確認",
+            "title": "保管庫の削除"
         },
-        "title": "Vaults"
+        "title": "保管庫"
     },
     "vault-settings": {
         "backup": {
-            "description": "Securely backup your vault locally when saving.",
+            "description": "保存時に保管庫をローカルに安全にバックアップ",
             "path": {
-                "helper": "Leave blank for default path",
-                "label": "Backup Path",
-                "placeholder": "Absolute backup path"
+                "helper": "デフォルトパスは空白",
+                "label": "パスをバックアップ",
+                "placeholder": "バックアップの絶対パス"
             },
-            "switch": "Enable local backups",
-            "title": "Backup"
+            "switch": "ローカルバックアップを有効化",
+            "title": "バックアップ"
         },
         "format": {
-            "a-description": "Format A is the original Buttercup vault format that uses deltas to store vault structure.",
-            "b-description": "Format B is the new Buttercup vault format that uses a JSON structure to manage vault structure and history.",
-            "a-upgrade-b": "You should upgrade to Format B, which is currently <strong>stable</strong>. It is recommended that you backup your vault before doing this.",
-            "description": "Manage current vault format and updates.",
-            "format-type": "Format {{format}}",
-            "title": "Format",
-            "upgrade-button": "Upgrade"
+            "a-description": "フォーマット A はButtercupオリジナルの保管庫フォーマットで、保管庫の構造を保存するためにデルタを使用します。",
+            "b-description": "フォーマット B は、保管庫の構造と履歴を管理するためにJSONを使用する新しいButtercup保管庫フォーマットです。",
+            "a-upgrade-b": "現在 <strong>推奨されている</strong>フォーマット B にアップグレードしてください。これを行う前に、保管庫をバックアップすることを推奨します。",
+            "description": "現在の保管庫のフォーマットとアップデートを管理",
+            "format-type": "フォーマット {{format}}",
+            "title": "フォーマット",
+            "upgrade-button": "アップグレード"
         },
-        "not-unlocked": "Vault must be unlocked to access this area.",
-        "title": "Vault Settings: {{title}}"
+        "not-unlocked": "このエリアにアクセスするには、金庫のロックを解除する必要があります。",
+        "title": "保管庫の設定: {{title}}"
     },
     "vault-tabs": {
         "context-menu": {
-            "lock-vault": "Lock vault",
-            "remove-vault": "Remove vault",
-            "unlock-vault": "Unlock vault",
-            "vault-settings": "Vault settings"
+            "lock-vault": "保管庫をロック",
+            "remove-vault": "保管庫を削除",
+            "unlock-vault": "保管庫をアンロック",
+            "vault-settings": "保管庫の設定"
         }
     }
 }