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what WordPress core functions do I have to modify to change

comments_popup_link('Ni komentarjev', '1 komentar','% komentarjev') 


comments_popup_link('Ni komentarjev', '1 komentar', **'2 komentarja',** '% komentarjev')

I'd like to add an argument for 2 comments. And what lines to add to this functions?

The reason why would I want to do that is simply the fact that in my home language we start plural by 3. I want it to be spelled correctly.

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You can't - you'll have to make a duplicate of that function and add that functionality – onetrickpony Oct 17 '11 at 19:34
Yes, but which function to duplicate and how to add that functionality. I was searching across the net and according to CatsWhoCode website, to replace core function you use filters – jesiher Oct 17 '11 at 20:21
This is located in your theme's files, so simply alter them (in a child theme possibly), the only filter that is available inside comments_popup_link() is comments_popup_link_attributes which is not quite useful in your case; where is that line of yours located again? – soulseekah Oct 18 '11 at 5:53

Filter 'comments_number'. You get the translated number and the real number as arguments. Return what fits best.

Sample code:

add_filter( 'comments_number', 'wpse_31328_comments_number_i18n', 10, 2 );

function wpse_31328_comments_number_i18n( $text, $number )
    if ( 2 === $number )
        return _x( '2 comments', 'comments number', 'your_text_domain' );
        // or hard coded:
        // return '2 komentarja';

    return $text
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