how set week start day or First day of the week ?

[Sérgio Basto]

Hello, 

How I change "First day of the week" for sun in Regional settings PT ?

If I change to Regional settings  US the "First day of the week" is
Sunday when set pt_PT the "First day of the week" is Monday , I'd like
see my calendar beginning on Sunday , without break all regional
settings , How I do that in KDE plasma 5 Fedora 28  ?

in an old thread [1] or in kde 4 looks like this [2]

Thanks

[1]

https://forum.kde.org/viewtopic.php?f=261&t=130581&p=353189&hilit=monday#p353189

[2]
http://i.imgur.com/w0GbZlP.png

-- 
Sérgio M. B.