How to change ISO diascards?

When I installed the system I chose ISO-8859-2 code of keyboard, and I don't have diacritics characters (I see ? or symbols).
Code:
a, ą, b-c, ć, d-e, ę, f-l, ł, m-n, ń, o, ó, p-s, ś, t-z, ź, ż.
And I can't see some files that use these characters in the GUI. How can I change the ISO norm, and what should it be?

Edit: I change keymap in KDE, but doesn't help...
hLUOa6m.jpg
 
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