{"en_US": "<t t-name=\"mass_mailing.iframe_css_assets_edit\">\n        <t t-call-assets=\"mass_mailing.assets_mail_themes\" t-js=\"false\"/>\n        <t t-call=\"mass_mailing.mass_mailing_mail_style\"/>\n        <t t-call-assets=\"mass_mailing.assets_mail_themes_edition\" t-js=\"false\"/>\n        <!-- To view the body_arch field in readonly and have it display exactly\n        like in edit, load all the same css. TODO: move all this and the above\n        to a separate asset -->\n        <t t-call-assets=\"web.assets_frontend\" t-js=\"false\"/>\n        <t t-call-assets=\"web_editor.assets_wysiwyg\" t-js=\"false\"/>\n    </t>"}