On utopian you can post for any opensource project, so you can post a course in spanish for wikiversity on utopian, but you need few sentences in english to introduce your post, because the moderator may not understand spanish.
When you post on utopian, you have to select a github, which is a welknown repository for opensource project. I am discussing on discord with the utopian group to know which github you will select to publish educational content.