change the words “WordPress running on theme” in “At a glance”,especially the link “theme.php”

This code may help you.

function wpfi_change_text( $translated_text ) {
        if ( $translated_text == 'ORIGINAL TEXT' ) {
            $translated_text="";
        }
        return $translated_text;
    }
    add_filter( 'gettext', 'wpfi_change_text', 20 );