diff --git a/web_widget_open_tab/i18n/ja.po b/web_widget_open_tab/i18n/ja.po
index cf0c15bfd..0608035d3 100644
--- a/web_widget_open_tab/i18n/ja.po
+++ b/web_widget_open_tab/i18n/ja.po
@@ -10,6 +10,7 @@ msgstr ""
 "PO-Revision-Date: 2023-05-27 08:24+0000\n"
 "Last-Translator: \n"
 "Language-Team: \n"
+"Language: \n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: \n"