In category view featured icon is in english while in article view is in polish. How to change icon in category view to polish ?

This is text - no icon, but it is not K2_Featured. In item view K2_Featued is used but what in category view ?

This is a background image coming from your CSS file. You need to either your stylesheet or override and replace that image (images/system/featured.png)

This is text. Here is a screenshot with featured not translated - category view


In article view featured is translated correctly

The first one appears to be an image which you have to replace, and the second one is a language string which can be translated.

You can also try pasting the code from the article instead of the image.
Make sure you are careful and notice where $this->item and $item-> are used.

I think that this is a text . Images "featured" are placed in /components/com_k2/images/system and are diffrent. But I don't understand how it works , in firefox inspector shows such html :

On screen I see
Jarmark świąteczny Praga Featured

When I remove h3.catItemTitle in firefox inspector title and featured are dissapeared

It is in your k2.css you need to edit the background property of the following classes (in your template's k2.css).

div.itemIsFeatured,
div.catItemIsFeatured,
div.userItemIsFeatured

I found it. It was : icon-featured.png and it was placed in ext/k2/ subfolder of my template ( JSN series ) , so template was overwriting k2,css > Thank for help :)