1-go to https://sx.wmflabs.org/index.php?title=Special:ContentTranslation&from=en&to=es&sx=true&page=Vlasovite&targettitle=Vlasovite#draft
2-start translating the "Structure" section
3-with the section title selected, click "Edit translation"
4-delete the last 4 characters of the word and save the translation
- at this point, the Proposed translation section is empty
5-click "apply"
- this appears
NOTE: if you do the same to a sentence instead of the title, the whole sentence disappears once you click "Apply"