Hi Andras, *,
I don't know if it's important for you, but on Pootle, some files are
empty, like in
https://translations.documentfoundation.org/fr/libo_ui/scp2/source/
there is also some in /sd/source/ui
Just wanted to mention it in case 
I sent a mail about this a few days ago. Basically when we updated
from 4.1 to 4.2 in Pootle, files from 4.1 that are not there in 4.2
have to be deleted manually.
Actually I had to create those manually, as otherwise pootle would
always abort the update process since either no corresponding .pot or
.po file is available to sync to...
So yes, having some empty files is expected, and the hopefully will
vanish on next update of the templates 
ciao
Christian