I started working on some translations (https://premium.wpmudev.org/translate/projects)
Translations are not easy without a preview of the result. Words, sentences and expressions do not have the same meaning depending on the context. The WPMU interface for translation does not offer a preview of the whole document (Even for partial work).
I do not know if I missed it or if it is simply actually not possible:
Can we have a translation preview as a whole?