WP: Modify Text Before & After Comments Form

modify-text-before-after-comments-form.php

// From http://wpsites.net/web-design/modify-text-before-after-comment-form/
function wpsites_change_note_after_comment_form($arg) {
    $arg['comment_notes_after'] = '<p class="comment-notes">' . __( 'Thanks for leaving an awesome comment!' ) . '</p>';
    return $arg;
}

add_filter('comment_form_defaults', 'wpsites_change_note_after_comment_form');

function wpsites_modify_text_before_comment_form($arg) {
    $arg['comment_notes_before'] = '<p class="comment-notes">' . __( 'We respect your privacy and will not publish your personal details.' ) . '</p>';
    return $arg;
}

add_filter('comment_form_defaults', 'wpsites_modify_text_before_comment_form');