referring to ticket #128840
It took me ages to finally implement the solution you gave in the above mentioned ticket, sorry that i did not test it earlier.
However, it does not seem to work, my translated shops keep on showing the english labels.
The files are present in the directories mentioned in the wpml translations, and i uploaded them manually in the media library.
I switched off the Cloudflare plugin to avoid that caching would be the cause.
Not sure where to look further.