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

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]

<a href="https://forum.kde.org/viewtopic.php?f=261&amp;t=130581&amp;p=353189&amp;hilit=monday#p353189" title="https://forum.kde.org/viewtopic.php?f=261&amp;t=130581&amp;p=353189&amp;hilit=monday#p353189">https://forum.kde.org/viewtopic.php?f=261&amp;t=130581&amp;p=353189&amp;hilit=monday...</a>

[2]
<a href="http://i.imgur.com/w0GbZlP.png" title="http://i.imgur.com/w0GbZlP.png">http://i.imgur.com/w0GbZlP.png</a>