diff --git a/install/includes/gettext/locale/ja/LC_MESSAGES/installer.po b/install/includes/gettext/locale/ja/LC_MESSAGES/installer.po
index 8933ffa4d..cf40a1aa3 100644
--- a/install/includes/gettext/locale/ja/LC_MESSAGES/installer.po
+++ b/install/includes/gettext/locale/ja/LC_MESSAGES/installer.po
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Report-Msgid-Bugs-To: translations@wavelog.org\n"
 "POT-Creation-Date: 2025-07-31 16:28+0000\n"
-"PO-Revision-Date: 2025-08-01 03:23+0000\n"
+"PO-Revision-Date: 2025-08-05 07:10+0000\n"
 "Last-Translator: \"S.NAKAO\" <hlx.nakao@gmail.com>\n"
 "Language-Team: Japanese <https://translate.wavelog.org/projects/wavelog/"
 "installer/ja/>\n"
@@ -21,155 +21,155 @@ msgstr ""
 
 #: install/includes/install_config/install_lib.php:123
 msgid "not detected"
-msgstr ""
+msgstr "検出されません"
 
 #: install/includes/interface_assets/footer.php:57
 msgid "Albanian"
-msgstr ""
+msgstr "アルバニア語"
 
 #: install/includes/interface_assets/footer.php:58
 msgid "Armenian"
-msgstr ""
+msgstr "アルメニア語"
 
 #: install/includes/interface_assets/footer.php:59
 msgid "Bosnian"
-msgstr ""
+msgstr "ボスニア語"
 
 #: install/includes/interface_assets/footer.php:60
 msgid "Bulgarian"
-msgstr ""
+msgstr "ブルガリア語"
 
 #: install/includes/interface_assets/footer.php:61
 msgid "Chinese (Simplified)"
-msgstr ""
+msgstr "中国語（簡体字）"
 
 #: install/includes/interface_assets/footer.php:62
 msgid "Croatian"
-msgstr ""
+msgstr "クロアチア語"
 
 #: install/includes/interface_assets/footer.php:63
 msgid "Czech"
-msgstr ""
+msgstr "チェコ語"
 
 #: install/includes/interface_assets/footer.php:64
 msgid "Dutch"
-msgstr ""
+msgstr "オランダ語"
 
 #: install/includes/interface_assets/footer.php:65
 msgid "English"
-msgstr ""
+msgstr "英語"
 
 #: install/includes/interface_assets/footer.php:66
 msgid "Estonian"
-msgstr ""
+msgstr "エストニア語"
 
 #: install/includes/interface_assets/footer.php:67
 msgid "Finnish"
-msgstr ""
+msgstr "フィンランド語"
 
 #: install/includes/interface_assets/footer.php:68
 msgid "French"
-msgstr ""
+msgstr "フランス語"
 
 #: install/includes/interface_assets/footer.php:69
 msgid "German"
-msgstr ""
+msgstr "ドイツ語"
 
 #: install/includes/interface_assets/footer.php:70
 msgid "Greek"
-msgstr ""
+msgstr "ギリシャ語"
 
 #: install/includes/interface_assets/footer.php:71
 msgid "Hungarian"
-msgstr ""
+msgstr "ハンガリー語"
 
 #: install/includes/interface_assets/footer.php:72
 msgid "Italian"
-msgstr ""
+msgstr "イタリア語"
 
 #: install/includes/interface_assets/footer.php:73
 msgid "Japanese"
-msgstr ""
+msgstr "日本語"
 
 #: install/includes/interface_assets/footer.php:74
 msgid "Latvian"
-msgstr ""
+msgstr "ラトビア語"
 
 #: install/includes/interface_assets/footer.php:75
 msgid "Lithuanian"
-msgstr ""
+msgstr "リトアニア語"
 
 #: install/includes/interface_assets/footer.php:76
 msgid "Montenegrin"
-msgstr ""
+msgstr "モンテネグロ語"
 
 #: install/includes/interface_assets/footer.php:77
 msgid "Polish"
-msgstr ""
+msgstr "ポーランド語"
 
 #: install/includes/interface_assets/footer.php:78
 msgid "Portuguese"
-msgstr ""
+msgstr "ポルトガル語"
 
 #: install/includes/interface_assets/footer.php:79
 msgid "Russian"
-msgstr ""
+msgstr "ロシア語"
 
 #: install/includes/interface_assets/footer.php:80
 msgid "Serbian"
-msgstr ""
+msgstr "セルビア語"
 
 #: install/includes/interface_assets/footer.php:81
 msgid "Slovak"
-msgstr ""
+msgstr "スロバキア語"
 
 #: install/includes/interface_assets/footer.php:82
 msgid "Slovenian"
-msgstr ""
+msgstr "スロベニア語"
 
 #: install/includes/interface_assets/footer.php:83
 msgid "Spanish"
-msgstr ""
+msgstr "スペイン語"
 
 #: install/includes/interface_assets/footer.php:84
 msgid "Swedish"
-msgstr ""
+msgstr "スウェーデン語"
 
 #: install/includes/interface_assets/footer.php:85
 msgid "Turkish"
-msgstr ""
+msgstr "トルコ語"
 
 #: install/includes/interface_assets/header.php:94
 msgid "Install | Wavelog"
-msgstr ""
+msgstr "インストール | Wavelog"
 
 #: install/index.php:35
 msgid "1. Welcome"
-msgstr ""
+msgstr "1. ようこそ"
 
 #: install/index.php:38
 msgid "2. Pre Checks"
-msgstr ""
+msgstr "2. 事前チェック"
 
 #: install/index.php:41
 msgid "3. Configuration"
-msgstr ""
+msgstr "3. 構成"
 
 #: install/index.php:44
 msgid "4. Database"
-msgstr ""
+msgstr "4. データベース"
 
 #: install/index.php:47
 msgid "5. First User"
-msgstr ""
+msgstr "5. 最初のユーザー"
 
 #: install/index.php:50
 msgid "6. Finish"
-msgstr ""
+msgstr "6. 仕上げ"
 
 #: install/index.php:67
 msgid "Welcome to the Wavelog Installer"
-msgstr ""
+msgstr "Wavelogインストーラへようこそ"
 
 #: install/index.php:68
 msgid ""
@@ -178,10 +178,13 @@ msgid ""
 "logging software. Follow the steps in each tab to configure and install "
 "Wavelog on your server."
 msgstr ""
+"このインストーラーは、Wavelogのインストールに必要な手順を案内します。<br>Wave"
+"logは、強力なWebベースのアマチュア無線ログソフトウェアです。各タブの手順に従"
+"って、Wavelogをサーバーに設定し、インストールしてください。"
 
 #: install/index.php:69
 msgid "Discussions"
-msgstr ""
+msgstr "議論"
 
 #: install/index.php:69
 #, php-format
@@ -189,97 +192,101 @@ msgid ""
 "If you encounter any issues or have questions, refer to the documentation "
 "(%s) or community forum (%s) on Github for assistance."
 msgstr ""
+"問題が発生した場合や質問がある場合は、GitHub のドキュメント (%s) "
+"またはコミュニティフォーラム (%s) を参照してサポートを受けてください。"
 
 #: install/index.php:69
 msgid "Wiki"
-msgstr ""
+msgstr "週"
 
 #: install/index.php:70
 msgid "Thank you for installing Wavelog!"
-msgstr ""
+msgstr "Wavelogをインストールしていただきありがとうございます！"
 
 #: install/index.php:71 install/index.php:74 install/index.php:1033
 msgid "Language"
-msgstr ""
+msgstr "言語"
 
 #: install/index.php:84
 msgid "Select a language"
-msgstr ""
+msgstr "言語を選択してください"
 
 #: install/index.php:96 install/index.php:418
 msgid "Close"
-msgstr ""
+msgstr "近い"
 
 #: install/index.php:106
 msgid "PHP Modules"
-msgstr ""
+msgstr "PHPモジュール"
 
 #: install/index.php:113
 msgid "Version"
-msgstr ""
+msgstr "バージョン"
 
 #: install/index.php:114
 #, php-format
 msgctxt "PHP Version"
 msgid "min. %s (recommended %s+)"
-msgstr ""
+msgstr "最小 %s（推奨 %s以上）"
 
 #: install/index.php:141
 msgid "Installed"
-msgstr ""
+msgstr "インストール済み"
 
 #: install/index.php:141
 msgid "Not Installed"
-msgstr ""
+msgstr "インストールされていません"
 
 #: install/index.php:149
 msgid "PHP Settings"
-msgstr ""
+msgstr "PHP設定"
 
 #: install/index.php:239
 msgid "Folder Write Permissions"
-msgstr ""
+msgstr "フォルダの書き込み権限"
 
 #: install/index.php:245 install/index.php:256 install/index.php:267
 #: install/index.php:278 install/index.php:289
 msgid "Success"
-msgstr ""
+msgstr "成功"
 
 #: install/index.php:248 install/index.php:259 install/index.php:270
 #: install/index.php:281 install/index.php:292
 msgid "Failed"
-msgstr ""
+msgstr "失敗した"
 
 #: install/index.php:299
 msgid "Web Server"
-msgstr ""
+msgstr "ウェブサーバー"
 
 #: install/index.php:302
 msgid "Version:"
-msgstr ""
+msgstr "バージョン:"
 
 #: install/index.php:309
 msgid "Important note for nginx users!"
-msgstr ""
+msgstr "nginx ユーザーへの重要な注意!"
 
 #: install/index.php:310
 msgid ""
 "Since you are using nginx as web server please make sure that you have made "
 "the changes described in the Wiki before continuing."
-msgstr ""
+msgstr "Web サーバーとして nginx を使用しているため、続行する前に、Wiki "
+"に記載されている変更が行われたことを確認してください。"
 
 #: install/index.php:319
 msgid "Some Checks have failed!"
-msgstr ""
+msgstr "一部のチェックに失敗しました！"
 
 #: install/index.php:320
 msgid "Check your PHP settings and install missing modules if necessary."
-msgstr ""
+msgstr "PHP "
+"設定を確認し、必要に応じて不足しているモジュールをインストールしてください。"
 
 #: install/index.php:321
 msgid ""
 "After that, you have to restart your webserver and start the installer again."
-msgstr ""
+msgstr "その後、Web サーバーを再起動してインストーラーを再度起動する必要があります。"
 
 #: install/index.php:322
 #, php-format
@@ -287,26 +294,32 @@ msgid ""
 "In case of failed 'Folder Write Permissions' check out our Wiki <a href='%s' "
 "target='_blank'>here</a>."
 msgstr ""
+"「フォルダ書き込み権限」が失敗した場合は、Wikiをご覧ください。 <a href='%s' "
+"target='_blank'> ここ </a> です。"
 
 #: install/index.php:328
 msgid "You have some warnings!"
-msgstr ""
+msgstr "いくつか警告があります！"
 
 #: install/index.php:329
 msgid ""
 "Some of the settings are not optimal. You can proceed with the installer but "
 "be aware that you could run into problems while using Wavelog."
 msgstr ""
+"一部の設定が最適ではありません。インストーラーを続行することはできますが、"
+"Wavelog の使用中に問題が発生する可能性があることにご注意ください。"
 
 #: install/index.php:336
 msgid "All Checks are OK. You can continue."
-msgstr ""
+msgstr "すべてのチェックは正常です。続行できます。"
 
 #: install/index.php:350
 msgid ""
 "Configure some basic parameters for your wavelog instance. You can change "
 "them later in 'application/config/config.php'"
 msgstr ""
+"Wavelogインスタンスの基本パラメータを設定します。これらのパラメータは後から「"
+"application/config/config.php」で変更できます"
 
 #: install/index.php:352
 msgid ""
@@ -315,14 +328,17 @@ msgid ""
 "check your web server configuration. This is the base_url in your config."
 "php, which can be edited after the installation."
 msgstr ""
+"これは、インストーラ実行後にWavelogインスタンスにアクセスできるURLです。期待"
+"どおりに表示されない場合は、Webサーバーの設定を確認してください。これはconfig"
+".phpのbase_urlで、インストール後に編集できます。"
 
 #: install/index.php:352
 msgid "Your final Wavelog URL"
-msgstr ""
+msgstr "最終的なWavelog URL"
 
 #: install/index.php:358
 msgid "Optional: Global Callbook Lookup"
-msgstr ""
+msgstr "オプション: グローバルコールブック検索"
 
 #: install/index.php:358
 msgid ""
@@ -332,37 +348,43 @@ msgid ""
 "credentials for QRZ.com. To also get the Call Locator in QRZ.com you'll need "
 "an XML subscription. HamQTH does not always provide the locator information."
 msgstr ""
+"この設定はオプションです。コールサイン検索は、このインストールのすべてのユー"
+"ザーが利用できます。QRZ.comとHamQTHのいずれかを選択できます。HamQTHもユーザー"
+"名とパスワードなしで動作しますが、QRZ.comの認証情報が必要です。QRZ.comでコー"
+"ルロケーターを取得するには、XMLサブスクリプションが必要です。HamQTHは常にロケ"
+"ーター情報を提供するとは限りません。"
 
 #: install/index.php:369 install/index.php:450 install/index.php:902
 msgid "Username"
-msgstr ""
+msgstr "ユーザー名"
 
 #: install/index.php:372 install/index.php:454 install/index.php:912
 msgid "Password"
-msgstr ""
+msgstr "パスワード"
 
 #: install/index.php:377
 msgid "Callbook Username"
-msgstr ""
+msgstr "コールブックユーザー名"
 
 #: install/index.php:380
 msgid "Callbook Password"
-msgstr ""
+msgstr "コールブックパスワード"
 
 #: install/index.php:382
 #, php-format
 msgid "Password can't contain %s or be empty"
-msgstr ""
+msgstr "パスワードに次の文字を含めることはできません %s または空"
 
 #: install/index.php:387
 msgid "Good to know:"
-msgstr ""
+msgstr "知っておくと良いこと:"
 
 #: install/index.php:388
 msgid ""
 "Use your callsign as your username for QRZ.com. The XML API does not support "
 "email addresses."
-msgstr ""
+msgstr "QRZ.comのユーザー名にはコールサインを使用してください。XML "
+"APIはメールアドレスをサポートしていません。"
 
 #: install/index.php:391 install/index.php:396
 msgid "Advanced Settings"
@@ -482,7 +504,7 @@ msgstr ""
 #: install/index.php:846 install/index.php:851 install/index.php:877
 #: install/index.php:883 install/index.php:885 install/index.php:1691
 msgid "Deleted DXCC"
-msgstr ""
+msgstr "DXCCを削除しました"
 
 #: install/index.php:892
 msgid "Last Name"