Greek translation is broken

Using latest activello (1.3.7) on testing environment (DesktopServer). The WordPress interface is in greek, the required files el.po, el_GR.po and el_GR.mo are present in the languages folder, but the theme remains in English.
Switching to a few other languages as WordPress interface does work fine. I should also mention that almost all multilingual themes have no issues.
Can you confirm the translation is broken? If it is, then I’m willing to do the translation again.
Regards.

OK, problem solved like that:

el.po – el.po.old
el_GR.po – el.po
el_GR.mo – el.mo

It works now- but why this should be necessary?

Hi there,
Thanks for reaching out.
In reference to your query here, I’m not quite certain what could have triggered the issue. Possibly a naming case for the respective .po and .mo files.
However, please feel free to reach out once again in case of any more issues.
Best Regards,
Support.