Retrieving custom field as shortcode

Put this in functions.php of your theme.

add_shortcode( 'dansk_url', 'dansk_url' );
function dansk_url() {
    $output="";
    $the_url= get_post_meta( get_the_ID(), 'dansk_url', true );

    if ( $the_url)  $output .= '<a href="' . esc_url( $the_url) . '">Dansk</a>';

    return $output;
}

and use shortcode [dansk_url] in the post.

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