custom-comment-form-label.php

<?php
/**
 * Customize comment form default fields.
 * Move the comment_field below the author, email, and url fields.
 */
function custom_comment_form_default_fields( $fields ) {
    $commenter     = wp_get_current_commenter();
    $user          = wp_get_current_user();
    $user_identity = $user->exists() ? $user->display_name : '';
    $req           = get_option( 'require_name_email' );
    $aria_req      = ( $req ? " aria-required='true'" : '' );
    $html_req      = ( $req ? " required='required'" : '' );
    $html5         = current_theme_supports( 'html5', 'comment-form' ) ? 'html5' : false;

    $fields = [
        'author' => '<p class="comment-form-author">' . '<label for="author">' . __( 'Name CUSTOMIZED', 'textdomain'  ) . ( $req ? ' <span class="required">*</span>' : '' ) . '</label> ' .
                    '<input id="author" name="author" type="text" value="' . esc_attr( $commenter['comment_author'] ) . '" size="30" maxlength="245"' . $aria_req . $html_req . ' /></p>',
        'email'  => '<p class="comment-form-email"><label for="email">' . __( 'Email CUSTOMIZED', 'textdomain'  ) . ( $req ? ' <span class="required">*</span>' : '' ) . '</label> ' .
                    '<input id="email" name="email" ' . ( $html5 ? 'type="email"' : 'type="text"' ) . ' value="' . esc_attr(  $commenter['comment_author_email'] ) . '" size="30" maxlength="100" aria-describedby="email-notes"' . $aria_req . $html_req  . ' /></p>',
        'url'    => '<p class="comment-form-url"><label for="url">' . __( 'Website CUSTOMIZED', 'textdomain'  ) . '</label> ' .
                    '<input id="url" name="url" ' . ( $html5 ? 'type="url"' : 'type="text"' ) . ' value="' . esc_attr( $commenter['comment_author_url'] ) . '" size="30" maxlength="200" /></p>',
    ];

    return $fields;
}
add_filter( 'comment_form_default_fields', 'custom_comment_form_default_fields' );

/**
 * Remove the original comment field because we've added it to the default fields
 * using newswire_comment_form_default_fields(). If we don't do this, the comment
 * field will appear twice.
 */
function newswire_comment_form_defaults( $defaults ) {
    if ( isset( $defaults[ 'comment_field' ] ) ) {
        $defaults[ 'comment_field' ] = '';
    }

    return $defaults;
}
add_filter( 'comment_form_defaults', 'newswire_comment_form_defaults', 10, 1 );
?>