追記ですが、翻訳時はコンソールに非同期処理のエラーが以下のように表示されています。
index.js?ver=6.1.1:1 GET https://www.marantz-mek.co.jp/en/wp-json/contact-form-7/v1/contact-forms/770/feedback/schema 403 (Forbidden)
(anonymous) @ index.js?ver=6.1.1:1
(anonymous) @ index.js?ver=6.1.1:1
c.reduceRight.url @ index.js?ver=6.1.1:1
(anonymous) @ index.js?ver=6.1.1:1
c.reduceRight.url @ index.js?ver=6.1.1:1
r @ index.js?ver=6.1.1:1
(anonymous) @ index.js?ver=6.1.1:1
contact/:1 Uncaught (in promise) Response {type: ‘basic’, url: ‘https://www.marantz-mek.co.jp/en/wp-json/contact-form-7/v1/contact-forms/770/feedback/schema’, redirected: false, status: 403, ok: false, …}body: (…)bodyUsed: falseheaders: Headers {}ok: falseredirected: falsestatus: 403statusText: “”type: “basic”url: “https://www.marantz-mek.co.jp/en/wp-json/contact-form-7/v1/contact-forms/770/feedback/schema”Prototype: Response
Promise.then
(anonymous) @ index.js?ver=6.1.1:1
