As an editor, would be nice to have a split view dedicated only for translation propuses, that can be used to compare and keep the consistance of the created pages, so if for example, on the left side can have the file to translate and cannot be changed, on the right side the file translation that can write into it and save the file in the file with the other locale. Preview shouldn't be required.
This can also allow to create a button in the wiki page to create a file in the desired locale and keep the file structure but with different locale, and then open this translation view.
I hope you find it useful.