Small Problem With WP-PageNavi Plugin. Please Advise.

Hello, I’m trying to change the “Page # of #” text in my search results navigation boxes. The default code in wp-pagenavi.php looks like this:

$options = new scbOptions(‘pagenavi_options’, __FILE__, array(
‘pages_text’ => __(‘Page %CURRENT_PAGE% of %TOTAL_PAGES%’, ‘wp-pagenavi’),

I have changed it to the following:

$options = new scbOptions(‘pagenavi_options’, __FILE__, array(
‘pages_text’ => __(‘Strona %CURRENT_PAGE% z %TOTAL_PAGES%’, ‘wp-pagenavi’),

But the text remains unchanged in my site’s front-end.

So basically, I would like it to say “Strona z” instead of “Page of”

Any help/advice is greatly appreciated.