Como cambio el idioma en la sección comentarios del blog

Hi there,

Have you sorted this out? I've checked your site and it seems to be translated already as shown here:
https://share.getcloudapp.com/v1uNZdOE

For the placeholder, you'll need add_filter( 'comment_form_default_fields',function(){ ... }));

Example:

add_filter( 'comment_form_default_fields',function($fields){ 
	$commenter = wp_get_current_commenter();
	$required = get_option( 'require_name_email' );

	$fields['author'] = sprintf(
		'<label for="author" class="screen-reader-text">%1$s</label><input placeholder="%1$s%3$s" id="author" name="author" type="text" value="%2$s" size="30" />',
		esc_html__( 'Nombre', 'generatepress' ),
		esc_attr( $commenter['comment_author'] ),
		$required ? ' *' : ''
	);

	$fields['email'] = sprintf(
		'<label for="email" class="screen-reader-text">%1$s</label><input placeholder="%1$s%3$s" id="email" name="email" type="email" value="%2$s" size="30" />',
		esc_html__( 'Correo Eléctronico', 'generatepress' ),
		esc_attr( $commenter['comment_author_email'] ),
		$required ? ' *' : ''
	);

	$fields['url'] = sprintf(
		'<label for="url" class="screen-reader-text">%1$s</label><input placeholder="%1$s" id="url" name="url" type="url" value="%2$s" size="30" />',
		esc_html__( 'Website', 'generatepress' ),
		esc_attr( $commenter['comment_author_url'] )
	);

	return $fields;
}, 15, 1);

You basically change the value in esc_html__( 'your translation', 'generatepress' ) for each field.

Muchas gracias. Me sirvió su orientación!

No problem. :)