You should be able to remove language versions from the version gadget.
In order to delete all language versions using the Versions gadget (will not work for the master language, i.e. the language in which the content was first created)
I am looking for an option to delete the language specific version of a page. Maybe I am missing something. I am just looking for a built-in solution (if available).
The "Move to Trash" will delete the whole page with all language versions (in below image).
I tried to search in forum, but I couldn't related it with the lates Optimizely version. Just like this forum