Probably this means that European Portuguese is set as the fallback language for Brazilian Portuguese, and that we don't have a Brazilian Portuguese translation to begin with. Or is there and Krita isn't automatically selecting it?

pt-br translation is available, but krita uses pt-pt by default even if my system language is pt-br.
Although pt-pt language, "change app language" from settings menu says pt-br is active. I need change to another language, restart krita, select pt-br in "change app language" and restart krita again to finally use the correct language.

krita 3.2.1 has the same bug.

Created attachment 109063 [details]
Krita in Brazilian Portuguese

I'm not sure I can distinguish between pt and pt_BR strings. If I set my desktop to to pt_BR and start the Krita 3.3.2 appimage, I says it's in pt_BR. In case that combobox is wrong, is there a word that I can use to see whether the right translation file is loaded?

Settting to needinfo: if you can confirm that my screenshot is correct, then I can only guess that this is a problem with arch linux and/or its krita packages.

"Ficheiro" in the upper left corner indicates pt language.
In pt-br is "Arquivo".

Okay, it looks like the pt_BR file has the correct translation:

#. i18n: ectx: property (title), widget (QMenu, menuFile)
#: krita/krita4.xmlgui:9 libs/widgetutils/xmlgui/ui_standards.xmlgui:5
#: plugins/extensions/pykrita/plugin/krita/sceditor/mainwindow.ui:28
#, kde-format
msgid "&File"
msgstr "&Arquivo"

Created attachment 109077 [details]
Krita in Brazilian Portuguese

Looks like I got it fixed :-)

Git commit adeeab654f993c9fdb5b891f9fe197cbedfc2623 by Boudewijn Rempt.
Committed on 27/11/2017 at 09:55.
Pushed by rempt into branch 'master'.

Use name, not bcp47Name to select the language for Krita

This fixes selection languages specialized for a country.

M  +4    -3    krita/main.cc

https://commits.kde.org/krita/adeeab654f993c9fdb5b891f9fe197cbedfc2623