Roman
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#29658 |

as per this thread, e.g. https://wordpress.org/support/topic/how-to-create-custom-post-format-and-add-it-on-custom-post-type?replies=5, it’s a core function of WordPress itself so you would need to digg more about that on some specialized websites, e.g. https://premium.wpmudev.org/blog/how-to-quickly-rename-a-wordpress-post-format/