I'm using Odoo 18 and have the same issue.

As a workaround, we can add a translated copy of the embedded code for each language and then do the following:

Click Edit and select an element of your website;

1. Go to the Text - Image section and Visibility;
2. Click No condition and select Conditionally instead;
3. Go to Languages to configure the condition(s) to apply by selecting Visible for or Hidden for, and click Choose a record to decide which languages are impacted.

This way only one version of the embedded code will be visible, conditional to the language.