"PO file “calls.master.pt_BR.po” is not UTF-8 encoded"

Summary

After pushing new pt_BR translation to Calls repository, via Damned Lies web interface, the following warning showed up: calls.master.pt_BR.po” is not UTF-8 encoded

But the PO file submitted is UTF-8, according to file:

$ file calls-master-po-pt_BR-963682.merged.po 
calls-master-po-pt_BR-963682.merged.po: GNU gettext message catalogue, Unicode text, UTF-8 text

Also, the pipeline for this submission in Calls repository presented no error.

I don't what action should be taken in this case, if any.

Steps to reproduce

• Apply the "Send to repository" action to send translation contributed to repository

What is the current bug behavior?

Show the message calls.master.pt_BR.po” is not UTF-8 encoded in Librem 5 - Purism page in Damned Lies

What is the expected correct behavior?

To not show this error message.

Relevant logs and/or screenshots

Possible fixes

No idea, sorry.