So i think i am missing something. Can anyone help me out ?
There are two non-profit organisations whom i proposed to install Nextcloud because its sure that it will make their work much easier. But Nextcloud is not so easy and a good user manual would be a fine start. Instead of explaining the same thing several times i prefer to spent some time in translating, hoping others do the same.
Try joining the Transifex team and start translating whatever section you found. I would guess there are communication tools for asking these sorts of questions within Transifex itself after joining.
I joined Transifex years ago. In transifex it is stated that Nextcloud user manual is 100 % translated, though when i look at it, it is far from 100%.
IMHO it is not a transifex problem (it may be mine).