edu-clean Theme Language files

Dear Sirs,

I am trying to translate the edu-clean theme and having no actual result.
Located the default.po file on theme's language folder.
Openned it and used poedit to generate new pt_BR.mo and pt_BR.mo.
Copied the new files to the language folder. No result.

Can you please give me some advice on:
1) My wp-config defines pt_BR as the languae. Is there any additional config to change the language?
2) Shall the localized files have any prefix?

Thanks in advance,