diff --git a/server/locales/ja/admin.json b/server/locales/ja/admin.json
new file mode 100644
index 00000000..27a76adf
--- /dev/null
+++ b/server/locales/ja/admin.json
@@ -0,0 +1,82 @@
+{
+  "profile": {
+    "displayname": "表示する名前",
+    "displaynameexample": "山田　太郎",
+    "email": "Eメール",
+    "lastprofileupdate": "最後のプロファイル更新",
+    "membersince": "アカウント登録日",
+    "password": "パスポート",
+    "passwordverify": "パスポートの確認",
+    "provider": "プロバイダ",
+    "savechanges": "保存する",
+    "subtitle": "プロファイルと認証情報",
+    "tfa": "二段認証",
+    "tfadisable": "二段認証を無効にする",
+    "tfadisabled": "無効済み",
+    "tfaenable": "二段認証を有効にする",
+    "tfaenabled": "有効済み"
+  },
+  "stats": {
+    "subtitle": "一般的なサイト統計",
+    "entries": "記事",
+    "uploads": "アップロード",
+    "users": "ユーザー"
+  },
+  "setings": {
+    "subtitle": "サイト設定を管理する"
+  },
+  "system": {
+    "subtitle": "Wikiの情報とユーティリティ",
+    "systemversion": "システムバージョン",
+    "currentversion": "現在のバージョン",
+    "latestversion": "最新バージョン",
+    "upgrade": "アップグレード",
+    "reinstall": "現在のバージョンを再インストールする",
+    "versioncheckfailed": "最新バージョンを照会できません。後で再試行してください。",
+    "administrativetools": "管理ツール",
+    "flushcache": "キャッシュをフラッシュしてインデックスを再構築する",
+    "flushcachetext": "コンテンツや検索結果の期限が滞っているか、最新のコンテンツがない場合は、キャッシュをフラッシュするとこれらの問題を解決できます。",
+    "flushcachebtn": "フラッシュと再構築する",
+    "resetaccounts": "システムアカウントをデフォルトにリセットする",
+    "resetaccountstext": "システムアカウント（ゲストアカウントなど）はデフォルト設定にリセットされます。",
+    "resetaccountsbtn": "システムアカウントをリセットする",
+    "flushsessions": "全てのユーザーセッションをフラッシュする",
+    "flushsessionstext": "全てのユーザーがログアウトし、再度ログインする必要があります。現在のセッションにも影響があります！",
+    "flushsessionsbtn": "セッションをフラッシュする",
+    "hostinfo": "ホスト情報",
+    "os": "オペレーティングシステム",
+    "nodeversion": "Node.jsバージョン",
+    "hostname": "ホスト名",
+    "cores": "CPUコア",
+    "totalmem": "合計メモリ",
+    "cwd": "作業ディレクトリ"
+  },
+  "theme": {
+    "subtitle": "Wikiのテーマを変更する",
+    "primarycolor": "原色",
+    "primarycolordesc": "トップナビゲーションバー、ヘッダー、リンクなどに使用されます",
+    "altcolor": "代替色",
+    "altcolordesc": "サイドバーに使用されます（暗い色調）",
+    "footercolor": "フッターの色",
+    "footercolordesc": "フッターに使用されます（明るい色調）",
+    "codeblock": {
+      "title": "コードブロック",
+      "dark": "暗いテーマを使用する",
+      "colorize": "コードを色分けする"
+    },
+    "savechanges": "保存する",
+    "reset": "デフォルトに戻す"
+  },
+  "users": {
+    "createauthorize": "ユーザーの作成・承認",
+    "subtitle": "ユーザーとアクセス権限の管理",
+    "name": "名前",
+    "email": "Eメール",
+    "provider": "プロバイダ",
+    "createdon": "作成日",
+    "updatedon": "変更日",
+    "returntousers": "ユーザー画面へ",
+    "edituser": "ユーザーの編集",
+    "uniqueid": "一意なID"
+  }
+}
diff --git a/server/locales/ja/auth.json b/server/locales/ja/auth.json
new file mode 100644
index 00000000..eade4c28
--- /dev/null
+++ b/server/locales/ja/auth.json
@@ -0,0 +1,32 @@
+{
+  "loginrequired": "ログインが必要です",
+  "loginusing": "ログイン...",
+  "loginusingalt": "又は...",
+  "fields": {
+    "emailuser": "Eメール又はユーザー名",
+    "password": "パスワード"
+  },
+  "actions": {
+    "login": "ログイン"
+  },
+  "errors": {
+    "invalidlogin": "不正なログイン",
+    "invalidloginmsg": "Eメール又はパスワードが無効です。",
+    "invaliduseremail": "無効なユーザーEメール",
+    "lognerror": "ログインエラー",
+    "notyetauthorized": "まだこのサイトにログインする権限がありません。",
+    "toomanyattempts": "試行回数が多すぎます",
+    "toomanyattemptsmsg": "短期間に失敗した試行回数が多すぎます。{{time}}にもう一度お試しください。",
+    "usernotfound": "ユーザーが見つかりません"
+  },
+  "providers": {
+    "local": "ローカル",
+    "windowslive": "Microsoft Account",
+    "azure": "Azure Active Directory",
+    "google": "Google ID",
+    "facebook": "Facebook",
+    "github": "GitHub",
+    "slack": "Slack",
+    "ldap": "LDAP / Active Directory"
+  }
+}
diff --git a/server/locales/ja/browser.json b/server/locales/ja/browser.json
new file mode 100644
index 00000000..d85706d0
--- /dev/null
+++ b/server/locales/ja/browser.json
@@ -0,0 +1,118 @@
+{
+  "editor": {
+    "codeblockinsert": "Insert Code Block",
+    "codeblocklanguage": "Language",
+    "codeblockloading": "Loading code syntax for {{name}}",
+    "codeblockloadingerror": "Error: Unable to load language syntax.",
+    "codeblocksuccess": "Your code block has been inserted.",
+    "codeblocktitle": "Insert Code Block",
+    "discard": "Discard",
+    "filedeleteaction": "Delete",
+    "filedeleteloading": "Deleting file...",
+    "filedeletedefault": "this file",
+    "filedeletesuccess": "File deleted successfully.",
+    "fileerror": "Unable to fetch updated listing.",
+    "filefolderempty": "This folder is empty.",
+    "fileinsert": "Insert Link to File",
+    "fileloading": "Fetching files...",
+    "filemoveaction": "Move to...",
+    "filemoveerror": "Move error: {{err}}",
+    "filemoveloading": "Moving file...",
+    "filemovesuccess": "File moved successfully.",
+    "fileprocessing": "Processing...",
+    "filerenameaction": "Rename",
+    "filesuccess": "File link has been inserted.",
+    "filetitle": "Insert File",
+    "fileupload": "Upload File(s)",
+    "fileuploaderror": "Upload Error: {{err}}",
+    "fileuploadsuccess": "File(s) uploaded successfully.",
+    "folders": "Folders",
+    "foldersloading": "Fetching folders list...",
+    "imagetitle": "Insert Image",
+    "imageinsert": "Insert Image",
+    "imagesuccess": "Image has been inserted.",
+    "imageupload": "Upload Image(s)",
+    "imagealignleft": "Left (default)",
+    "imagealigncenter": "Centered",
+    "imagealignright": "Right",
+    "imagealignlogo": "Page Logo",
+    "newfolder": "New Folder",
+    "videoanymp4file": "Any standard MP4 file",
+    "videoinsert": "Insert Video",
+    "videolinktitle": "Enter the link to the video to be embedded:",
+    "videonotsupported": "This URL is invalid or not supported!",
+    "videosuccess": "The video code has been inserted.",
+    "videosupportedtitle": "The following are supported:",
+    "videotitle": "Insert Video"
+  },
+  "history": {
+    "pastversions": "Past Versions",
+    "timestamp": "Timestamp",
+    "author": "Author",
+    "commit": "Commit",
+    "comparewith": "Compare With...",
+    "view": "View",
+    "reverttoversion": "Revert to Version",
+    "sidebyside": "Side-by-side View"
+  },
+  "modal": {
+    "abort": "Abort",
+    "anchorerror": "Clipboard copy failed. Copy the URL manually.",
+    "anchorsuccess": "The URL has been copied to your clipboard.",
+    "anchortitle": "Copy link to this section",
+    "copyclipboard": "Copy to Clipboard",
+    "create": "Create",
+    "createpageinvalid": "This page path is invalid!",
+    "createpagepath": "Enter the new page path:",
+    "createpagetitle": "Create New Page",
+    "createuser": "Create User",
+    "createuserauthorize": "Authorize User",
+    "createuseremail": "Email address:",
+    "createuseremailplaceholder": "e.g. john.doe@company.com",
+    "createusername": "Full Name:",
+    "createusernameplaceholder": "e.g. John Doe",
+    "createuserpassword": "Password:",
+    "createuserprovider": "Provider:",
+    "createusertitle": "Create / Authorize User",
+    "delete": "削除",
+    "deletefiletitle": "を削除する？",
+    "deletefilewarn": "本当に削除しますか？",
+    "deletepagewarning": "Are you sure you want to delete this page? This action cannot be undone!",
+    "deletepagetitle": "Delete this page?",
+    "deleteusertitle": "Delete User Account?",
+    "deleteuserwarning": "Are you sure you want to delete this user account? This action cannot be undone!",
+    "discard": "Discard",
+    "discardpagecreate": "Are you sure you want to leave this page and lose anything you wrote so far?",
+    "discardpageedit": "Are you sure you want to leave this page and lose any modifications?",
+    "discardpagestay": "Stay on page",
+    "discardpagetitle": "Discard?",
+    "move": "Move",
+    "movepageinvalid": "This page path is invalid or not allowed!",
+    "movepagepath": "Enter the new page path:",
+    "movepageplaceholder": "page-name",
+    "movepagetitle": "Move Page",
+    "movepagewarning": "Note that moving or renaming pages can lead to broken links. Make sure to edit any page that links to this page afterwards!",
+    "newfolderinvalid": "This folder name is invalid!",
+    "newfolderloading": "Creating new folder...",
+    "newfoldername": "Enter the new folder name:",
+    "newfoldernameplaceholder": "folder name",
+    "newfoldersuccess": "New folder {{name}} created.",
+    "newfoldertitle": "New Folder",
+    "renamefile": "Rename",
+    "renamefileerror": "Rename error: {{err}}",
+    "renamefileinvalid": "This filename is invalid!",
+    "renamefileloading": "Renaming file...",
+    "renamefilename": "Enter the new filename (without the extension) of the file:",
+    "renamefilenameplaceholder": "filename",
+    "renamefiletitle": "Rename File"
+  },
+  "nav": {
+    "home": "ホーム"
+  },
+  "search": {
+    "didyoumean": "Did you mean...?",
+    "nomatch": "No results matching your query",
+    "placeholder": "Search...",
+    "results": "Search Results"
+  }
+}
diff --git a/server/locales/ja/common.json b/server/locales/ja/common.json
new file mode 100644
index 00000000..0944ce42
--- /dev/null
+++ b/server/locales/ja/common.json
@@ -0,0 +1,51 @@
+{
+  "wiki": "Wiki",
+  "header": {
+    "overview": "概要",
+    "createdoc": "記事を作成する"
+  },
+  "footer": {
+    "poweredby": "Powered by",
+    "home": "ホーム",
+    "top": "トップ"
+  },
+  "sidebar": {
+    "nav": "ナビ",
+    "navigation": "ナビゲーション",
+    "pagecontents": "ページの内容",
+    "pastversions": "履歴"
+  },
+  "nav": {
+    "account": "アカウント",
+    "allpages": "全ての記事",
+    "create": "作成",
+    "discard": "キャンセル",
+    "edit": "編集",
+    "history": "履歴",
+    "login": "ログイン",
+    "logout": "ログアウト",
+    "move": "移動",
+    "myprofile": "マイページ",
+    "normalview": "普通の画面",
+    "root": "ホーム",
+    "savechanges": "保存する",
+    "savedocument": "記事を保存する",
+    "settings": "設定",
+    "source": "ソースコード",
+    "stats": "統計",
+    "sysinfo": "システム内容",
+    "syssettings": "システム設定",
+    "theme": "カラーテーマ",
+    "users": "ユーザー",
+    "viewlatest": "最新を見る"
+  },
+  "welcome": {
+    "title": "Wikiへよこそ！",
+    "subtitle": "ます、ホームページを作りましょう。",
+    "createhome": "ホームページの作成"
+  },
+  "loading": {
+    "source": "ソースコードをロード中...",
+    "editor": "編集画面をロード中..."
+  }
+}
diff --git a/server/locales/ja/errors.json b/server/locales/ja/errors.json
new file mode 100644
index 00000000..4ad60a3b
--- /dev/null
+++ b/server/locales/ja/errors.json
@@ -0,0 +1,30 @@
+{
+  "alreadyexists": "この記事は既に存在します",
+  "debugmsg": "詳細なデバッグトレイル",
+  "fileexists": "ファイル{{path}}は既に存在します。",
+  "forbidden": "禁じられました",
+  "forbiddendetail": "このページにアクセスするために必要な権限がありません。",
+  "generic": "エラーが発生しました",
+  "invalidaction": "無効なアクション.",
+  "invaliddestfolder": "無効なデスティネーションフォルダ",
+  "invalidfiletype": "無効なファイルタイプ",
+  "invalidfolder": "無効なフォルダ.",
+  "invalidoperation": "無効な操作",
+  "invalidpath": "無効なページパス",
+  "invaliduserid": "無効なユーザーID",
+  "newpasswordtooshort": "新しいパスワードが短すぎます",
+  "notexist": "記事{{path}}は存在しません",
+  "notexistdetail": "この記事を作成しますか？",
+  "parentinvalid": "親エントリは有効なファイルではありません。",
+  "parentisroot": "親エントリはトップです。",
+  "remotetoolarge": "モートファイルが大きすぎます",
+  "reservedname": "システムによって予約されているので、この名物名称で記事を作成することはできません。",
+  "savefailed": "記事の保存は失敗しました",
+  "starterfailed": "スターターコンテンツを読み込めませんでした",
+  "unauthorized": "無許可",
+  "actions": {
+    "create": "作成",
+    "gohome": "ホームへ",
+    "loginas": "ログイン..."
+  }
+}
diff --git a/server/locales/ja/git.json b/server/locales/ja/git.json
new file mode 100644
index 00000000..b845cc13
--- /dev/null
+++ b/server/locales/ja/git.json
@@ -0,0 +1,6 @@
+{
+  "added": "{{path}}を追加しました",
+  "deleted": "{{path}}を削除又は名称を変更する",
+  "updated": "{{path}}を変更しました",
+  "uploaded": "{{path}}をアップロード"
+}