Problem exporting/importing theme translation (Akira, not tested with other)

[Jimmy]

Jimmy submitted a new ticket:

Problem exporting/importing theme translation (Akira, not tested with other)

Content:

Hi there,

I have a big problem exporting/importing theme translation (Akira 2.4.0).
I have two prestashop 1.7.8.7 installed, one in /www and the other in /dev.
My goal is to be able to copy/paste the translated files from one to the other (basic thing).
Once the theme is translated in /dev (/app/Resources/[lang]/*.xlf), I save the files by doing an export and get 5 or 6 files.
When I want to copy them to /www, I notice that the file sizes are identical! As if the translations were written...