This code will allow you to customize the comment field labels and will move the comment form below the fields. Add the code to your functions.php or to a plugin.
To change the labels, modify the Name CUSTOMIZED, Email CUSTOMIZED, and Website CUSTOMIZED, and Comment * CUSTOMIZED text.
/**
* Customize comment form default fields.
* Move the comment_field below the author, email, and url fields.
*/
function wpse250243_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>',
'comment_field' => '<p class="comment-form-comment"><label for="comment">' . _x( 'Comment * CUSTOMIZED', 'noun', 'textdomain' ) . '</label> <textarea id="comment" name="comment" cols="45" rows="8" maxlength="65525" aria-required="true" required="required"></textarea></p>',
];
return $fields;
}
add_filter( 'comment_form_default_fields', 'wpse250243_comment_form_default_fields' );
/**
* Remove the original comment field because we've added it to the default fields
* using wpse250243_comment_form_default_fields(). If we don't do this, the comment
* field will appear twice.
*/
function wpse250243_comment_form_defaults( $defaults ) {
if ( isset( $defaults[ 'comment_field' ] ) ) {
$defaults[ 'comment_field' ] = '';
}
return $defaults;
}
add_filter( 'comment_form_defaults', 'wpse250243_comment_form_defaults', 10, 1 );