<?php
function theme_customizer_add_txt($wp_customize)
{
  $wp_customize->add_section('original_txt_section', array(
    'title' => 'Frontpage',
    'priority' => 230,
  ));

  $wp_customize->add_setting('original_txt', array(
    'type' => 'option',
    'sanitize_callback' => 'wp_filter_post_kses'
  ));
  $wp_customize->add_control('original_txt', array(
    'settings' => 'original_txt',
    'label' => 'catchphrase',
    'section' => 'original_txt_section',
    'type' => 'textarea',
  ));
}
add_action('customize_register', 'theme_customizer_add_txt');