[systemsettings] [Bug 509902] KDE apps are not honoring the language setting from System Settings

[bugzilla_noreply]

https://bugs.kde.org/show_bug.cgi?id=509902

--- Comment #15 from hanyo...@protonmail.com ---
I think I have figured out what happened in kxmlgui. Specifically, this block
of code:
```
for (int i = 0; i < languagesList.count();) {
        QString languageCode = languagesList[i];
        if (!KLocalizedString::isApplicationTranslatedInto(languageCode)) {
            if (stripCountryCode(&languageCode)) {
                if
(KLocalizedString::isApplicationTranslatedInto(languageCode)) {
                    languagesList[i] = languageCode;
                    ++i;
                    continue;
                }
            }
            languagesList.removeAt(i);
        } else {
            ++i;
        }
    }
```
The languagesList is QList("pt_Latn_BR", "pt_BR", "pt_Latn", "pt"), we check if
the application has the translation for each language.

I'm pretty sure we only have translations for "pt_BR" and "pt_PT".
Now, for the first language we check -- "pt_Latn_BR", we don't have translation
for that, so the function "stripCountryCode" is executed.
After stripping country code, the language becomes "pt", and we have
translation for "pt", so the first language in the list is "pt", the first item
in the list is used as primary language.

The fault is in "stripCountryCode", this essentially turns "pt_Latn_BR" into
"pt".

I'll come up with a fix tomorrow after work, since it's midnight here.

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